case study of class 8 science

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Cbse, ncert and icse solution online, class 8 science case study question, case study question class 8 science (cbse / ncert board).

Class 8 Science Case Study Question and Answer: CBSE / NCERT Board Class 8 Science Case Study Question prepared by expert Science Teacher. Students can learn Case Based Question / Paragraph Type Question for NCERT Class 8 Science.

There are total 18 chapter Crop Production and Management, Microorganisms: Friend and Foe

, Synthetic Fibres and Plastics, Materials: Metals and Non-Metals, Coal and Petroleum, Combustion and Flame, Conservation of Plants and Animals, Cell – Structure and Functions, Reproduction in Animals, Reaching the Age of Adolescence, Force and Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena, Light, Stars and the Solar System, Pollution of Air and Water

For any problem during learning any Case or any doubts please comment us. We are always ready to help You.

CBSE Class 8 Science Case Study Question

• Chapter 1 Crop Production and Management Case Study Question
• Chapter 2 Microorganisms: Friend and Foe Case Study Question
• Chapter 3 Synthetic Fibres and Plastics Case Study Question
• Chapter 4 Materials: Metals and Non-Metals Case Study Question
• Chapter 5 Coal and Petroleum Case Study Question
• Chapter 6 Combustion and Flame Case Study Question
• Chapter 7 Conservation of Plants and Animals Case Study Question
• Chapter 8 Cell – Structure and Functions Case Study Question
• Chapter 9 Reproduction in Animals Case Study Question
• Chapter 10 Reaching the Age of Adolescence Case Study Question
• Chapter 11 Force and Pressure Case Study Question
• Chapter 12 Friction Case Study Question
• Chapter 13 Sound Case Study Question
• Chapter 14 Chemical Effects of Electric Current Case Study Question
• Chapter 15 Some Natural Phenomena Case Study Question
• Chapter 16 Light Case Study Question
• Chapter 17 Stars and the Solar System Case Study Question
• Chapter 18 Pollution of Air and Water Case Study Question

What is Case Study Question?

Ans. At case Study there will one paragraph and on the basis of that concept some question will made. Students have to solve that question.

How many marks will have at case based question?

Most of time 5 questions will made from each case. There will 1 or 2 marks for each question.

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Class 8 Science Important Questions with Answers

• Class 8 Important Question

CBSE Class 8 Science Chapter wise Important Questions - Free PDF Download

Class 8 Science is a very crucial subject that needs proper attention from the students. Preparing all the chapters in this subject will help students to boost their overall scores in the exams. This is where students will need the assistance of Class 8 Science Important Questions with Answers PDF for all chapters. Apart from the exercises, these important questions can boost the preparation of the students. The experts have solved all these questions to assist in preparing this subject properly.

If you are currently studying in Class 8 , consider it one of your school life milestones as you start entering into in-depth studies related to Science. You need to solve Class 8 Science’s important questions apart from studying the Science book in such a scenario. You can expect your syllabus to comprise different aspects of scientific studies. The question papers with the solution can be the best support for those who are weak in Science or fear facing the challenge of learning complicated concepts of higher-level Science. The NCERT Class 8 Science important questions and their CBSE solutions can act as the students’ study materials.

You can also download NCERT Solution for Class 8 Science and Class 8 Maths to help you to revise complete syllabus and score more marks in your examinations.

Note: ➤ Predict your NEET rank effortlessly with our NEET Rank Predictor 2024 !

Download CBSE Class 8 Science Important Questions with Answers 2024-25 PDF

Also, check CBSE Class 8 Science Important Questions for chapter-wise PDF for other chapters:

Chapterwise Important Questions for CBSE Class 8 Science

Class 8 Science: Chapter-wise Important Questions

Chapters included in class 8 science ncert book.

As a student, you must know about the chapters included in the Science book of Class 8 NCERT Science book . Moreover, the relevance of some chapters in their everyday life is given here in brief:

Microorganisms: While studying the chapter on microorganisms, you will acquire knowledge regarding life under a microscope. Moreover, here you will understand which are friendly to us and the ones which are not.

Materials and Their Nature: The chapter dealing with materials and their nature is covered in one of the chapters of the Science book. You can read the book and refer to the study materials of Vedantu to understand all about the matter in detail.

Light: A chapter in the Science book for Class 8 deals with the concepts of light. You can understand how light travels and how you can split and converge white light. In the Science book, you can also find the basic experiments that you can do with light. The NCERT Class 8 Science important questions with answers come from this chapter.

Coal and Petroleum: While studying the chapter coal and petroleum, you can know about the mines and get a clear picture of how a mine works. Moreover, you can also know the places in India where the mines are found. The information about the revenue earned by the country from the coal mines is also mentioned in the chapter.

Sound: Sound is another most important chapter which you can study in detail with the NCERT Science book of Class 8. There are different experiments that you can know about from the book. Expect to learn the numerics related to the chapter also.

So, it is clear that the Science book of Class 8 has a combination of the chapters that belong to its main streams like Chemistry, Physics, and Biology.

Solved Examples

Q1. What is the Difference Between a Virus from Other Organisms?

Answer: The main difference between all other microorganisms from a virus is that it grows inside a host cell. All other unicellular organisms grow independently.

Q2. What are the Types of Reproductions that Occur in Living Organisms?

Answer: In all living organisms, there are two types of reproduction such as asexual reproduction and sexual reproduction. Asexual reproduction mainly happens in lower class organisms, where the higher ones reproduce sexually.

Significance of CBSE Class 8 Science Important Questions with Answers PDF

There are 18 chapters included in the Class 8 Science syllabus that covers vivid topics related to pollution, astronomy, light, natural phenomena, sound, force, friction, etc. These chapters need the highest attention from the students to complete preparing the syllabus. To reinforce the concepts and scientific principles, students can use the Class 8 Science Important Questions with Answers for all chapters.

Class 8 Science Term 2 Important Questions with Solutions have been compiled by following the latest CBSE syllabus to cover all the essential topics in the chapters. These questions are formulated by following the question patterns and formats of the CBSE board . In fact, the solutions are framed in a more straightforward tone so that students can easily comprehend the context behind the questions and can relate to the answers.

These Important Questions for the Class 8 Science Board Exam can be used as an evaluation tool by the students. They can solve the questions once the chapters are completed and compare their answers to the solutions. This way, they can spot the gaps in the preparations and focus on the important sections of the chapters further.

Advantages of CBSE Class 8 Science Important Questions with Answers for Board Exam

The questions have been compiled for individual chapters. Hence, the list contains separate files dedicated to all the chapters. It will become easier for the students to find the files and add them to their practice sessions.

The solutions provided with the questions are framed in a comprehensive way so that students can memorize them easily and recall them during the exams to score more.

Resolving doubts will be much easier when you have the Class 8 Science Important Questions with Answers PDF in your hands. Refer to the solutions and clarify your queries instantly to proceed with your preparation.

Follow the standard answering format of the solutions to keep your answers at par with the CBSE Class 8 standards and score more.

CBSE Class 8 Science Study Materials

Other CBSE Class 8 Important Questions Related Links

The Class 8 Science Important Questions with Answers provided by Vedantu offer valuable insights in simple language. These resources aim to enhance understanding and retention of key scientific concepts among students. By presenting essential questions and providing clear, concise answers, Vedantu helps learners grasp fundamental principles effectively. The emphasis on simplicity ensures that students can easily comprehend complex topics, fostering a strong foundation in science.

Get the free PDF version of these questions and solutions for all the chapters. Practice answering these questions and develop your concepts better. Learn how to attempt to answer such fundamental questions by following the solutions and gaining confidence to stay ahead of the competition.

FAQs on Class 8 Science Important Questions with Answers

1. What is the relevance of practising extra questions of Class 8 Science?

Ans: You can enjoy a lot of perks while solving more questions that are generally available on the Vedantu website. It can help you write different answers for a common question as per the right concept that can fetch good marks. The best you can do is consult with the experts of Vedantu and go through the papers available on their site. Moreover, the Vedantu question papers can help you to revise a chapter after completion. Mostly, you can enhance the language and presentation style of the answers while solving the papers. Make sure to draw the diagrams wherever needed as it can boost up the chances of getting marks.

2. Why is it important to find CBSE question papers for preparing a Science chapter, and where can we get them?

Ans: You should always get the CBSE question papers for solving as it can help you know the examination pattern. So, you can get questions in a familiar language while facing the examination. You can visit the site of Vedantu and get all the question papers. There are links where you can click and see the questions based on years. Remember to pick up random question papers from the Vedantu site and solve it multiple times in the intervals of short periods. Access to the question papers is free and you can easily download the pdf versions from the site.

3. What are the chapters included in the NCERT book of Class 8 Science?

Ans: The NCERT book of Class 8 Science consists of the following chapters:

Chapter 1–Crop Production and Management

Chapter 2 –Microorganisms: Friend or Foe

Chapter 3–Synthetic Fibres and Plastics

Chapter 4–Materials: Metals and Non-Metals

Chapter 5–Coal and Petroleum

Chapter 6–Combustion and Flame

Chapter 7–Conservation of Animals and Plants

Chapter 8 - Cell- Functions and Structure

Chapter 9–Reproduction in Animals

Chapter 10–Reaching the Age of Adolescence

Chapter 11–Force and Pressure

Chapter 12–Friction

Chapter 13–Sound

Chapter 14–Chemical Effects of Electric CurrentChapter 15–Some Natural Phenomena

Chapter 16 - Light

Chapter 17–Star and The Solar System

Chapter 18–Pollution of Water and Air

4. How can I develop the best study plan for Class 8 Science?

Ans: To develop the best study plan for Class 8 Science obey the given points:

Managing time is very important. Therefore, create a timetable so that you can focus on every chapter.

Use the NCERT book for reading the chapters as the content of the book is prepared by professionals.

Take the help of Vedantu’s website for downloading the important questions of all the chapters.

Work out on the sample papers and previous years question papers to have a strong grip on the topics.

5. What is the method that students follow to download the important questions of Class 8 Science?

Ans: Beneath are the steps that will be helpful in downloading the important questions of Class 8 Science:

Visit the link of Important Questions for CBSE Class 8 Science, Chapter wise Solutions - Free PDF Download.

As the link will open, the official page of Vedantu will appear on the screen of your device.

This official page will provide you with the list of the chapters of Class 8 Science.

Select the chapter you want to download for the important questions.

Then hit on the “Download PDF” option.

The important questions will get downloaded in PDF format.

6. What are the benefits of downloading and studying important questions of Class 8 Science from Vedantu?

Ans: The perks of studying or downloading important questions of Class 8 Science from Vedantu are:

The content is prepared by the subject matter experts.

Important questions of all the chapters are available.

These problems are based on the NCERT syllabus. 

Vedantu allows you to study offline by giving the option to download the important questions.

These important questions are available in the form of PDF files. These solutions are available at free of cost on Vedantu(vedantu.com) and mobile app.

Vedantu also allows you to ask your doubts through online chat.

7. How to achieve good results in Class 8 Science?

Ans: Below are the points which will help students in getting a good result in Class 8 Science:

To start with your preparation, first know about your syllabus.

Study every chapter from the NCERT book.

Make use of mock tests and previous years sample papers to get a hint about the exam pattern.

Have a habit of writing. This will improve your writing speed and help you to learn things faster.

While giving the exam, try to solve those questions first whose answer you know.

8. What is the most important chapter in science class 8?

Cell Structure and Function: This lays the groundwork for understanding living organisms.

Chemical Reactions and Equations: Understanding chemical reactions is crucial for various scientific concepts.

Light: This chapter forms the basis for understanding optics and other phenomena.

9. How to get 100 marks in science class 8?

While aiming for a perfect score is commendable, the focus should be on thorough understanding rather than just marks. However, here are some tips that might help:

Grasp concepts deeply: Don't just memorize facts, strive to understand the "why" behind them.

Practice consistently: Regularly solve problems, answer practice questions, and revise concepts.

Pay attention in class: Actively participate, ask questions, and clarify doubts with your teacher.

Manage time effectively: Create a study plan, schedule revisions, and avoid last-minute cramming.

10. Class 8 is very important?

Class 8 acts as a bridge between the foundational concepts learned in earlier grades and the more complex topics introduced in higher classes. It's crucial for building a strong foundation in Science and other subjects.

11. How to top in science exam class 8?

While "topping" isn't the only measure of success, here are some strategies:

Follow the tips mentioned above to get high marks.

Focus on understanding the exam format and marking scheme.

Practice mock tests and previous year papers to manage time and get familiar with the question pattern.

Seek help from teachers or tutors if you face any difficulties.

Important Questions for CBSE Class 8

Cbse class 8 study materials, home tuitions in india.

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• 1.0 CBSE Class 8 Science

Physics, Chemistry, and Biology are three cornerstone subjects in CBSE's 8th-class science curriculum that are very important for the scientific learning process. The curriculum for the 8th class is aimed at sharpening students' understanding of fundamental concepts in science and/or igniting in students the insatiable thirst for curiosity about their environment.

The course contains elements related to physics, chemistry, and biology. Foundational concepts are taught in each of these areas that will be quite useful for future science classes. 

This blog will cover topics related to CBSE Class 8 Science, such as the class syllabus, important books, and more, which students must know to score well in Class 8 Science.

• 2.0 CBSE Class 8 Science Syllabus

The CBSE Class 8 syllabus aims to provide students with a profound understanding of mathematical concepts and instil critical thinking skills in them. Instead of focusing on students mastering pre-existing algorithms, the syllabus tries to teach them to understand the basic principles of mathematics. The aim is to make them enjoy the subject and to get them to develop their strategies for solving and posing problems. Mastering the Class 8 Maths syllabus is not solely about being ready for exams. Instead, it is a foundation for excelling in board examinations and developing a solid mathematical mindset. Here's a detailed overview of the CBSE Class 8 Maths syllabus:

The CBSE Class 8 Science syllabus is designed to provide a comprehensive understanding of fundamental scientific concepts across Physics, Chemistry, and Biology. Here is a breakdown of the syllabus:

• 3.0 CBSE Class 8 Science Books

The CBSE Class 8 Science books are carefully designed based on the syllabus and help students understand science thoroughly. Moreover, these books include all the essential chapters of Physics, Chemistry, and Biology, with lucid and comprehensive explanations that facilitate students' understanding of key ideas. Focusing on these core subjects aims to develop students' critical thinking abilities, analytical skills, and a strong base in the concepts of science to help them learn in subsequent levels.

1. NCERT Textbook for Class 8 Science

CBSE Class 8 Science books in the curriculum have been specially prepared to support students in developing a good understanding of science. It covers all the important topics of Physics, Chemistry, and Biology while providing clear explanations and interesting content that support students in understanding the core concepts of each discipline. By focusing on the disciplines of these subjects, the books aim to enhance the students' ability to think critically, and analytically, and to help them build a solid foundation in science to prepare them for the sciences in upper grades.

2. Additional Reference Books

These books enhance the academic experience for students, by giving a range of questions, particularly advanced-level questions, that encourage students to utilize concepts and deepen their understanding of the course materials. Here are some additional reference resources students can practice with: 

• Lakhmir Singh
• 4.0 CBSE Class 8 Science Mock Tests

CBSE Class 8 Science mock tests are customized to fit each student's strengths and weaknesses and are the most effective way to measure exam preparedness in the subjects. After each mock test, students can learn from their mistakes, work on them, and avoid repeating the same mistakes in the final exam.

Mock tests that are followed by the practice encouraged students to develop time management skills which were applied during the real exam. By getting mock tests regularly, you will be able to follow up on your improvement and keep improving at all times. Improve your performance with ALLEN’s Mock Test designed by by some of India's top expert faculties.

• 5.0 CBSE Class 8 Science Preparation Tips

1. Understanding the Syllabus: Before diving into your studies, it is critical to gain full knowledge of the entire curriculum to avoid overlooking any topics. When you have understood what is required, the best plan is to divide the syllabus into smaller manageable parts. In this way, on the one hand, you can pay attention to the section at a time; on the other hand, you can organize better your study sessions, set realistic goals, and be sure that all topics are covered.

2. Regular revision: To keep information in your mind and make it solid, you need to revise it periodically. Another way is to test yourself on a topic without using the book or notes. Memory is enhanced through this active recall exercise, and areas that require more attention are identified. On top of that, flashcards can be used for reviewing the main ideas, definitions and terms in the course work. By constantly going through these flashcards, one might be able to easily remember what was contained in them keeping the information fresh in one’s mind hence making it easier to retrieve during exams.

3. Practice Regularly: If you want to excel in your examinations, regular practice is very essential. One of the strategies is executing mock tests, this can be an evaluation of personal preparation; hence, one can see where some improvements may be needed. When practising, focus on finishing the questions within the time frame to improve your speed and accuracy. 

4. Ask for Doubts: If you are having any doubts or questions while studying, never hesitate to ask for help. Ask your teacher or classmates who can help you understand the problem topics. Learning among one another's classmates helps because the discussion of the concepts confers understanding over and over again, with new insights.

5. Stay Healthy and Focused: Among the most important prerequisites for studying well are health and focus. Therefore, one should get adequate sleep at night to help the mind remain alert and the focus sharp. Wholesome nutrition will help retain one's energy levels throughout the day so that one may focus easily while studying. Breaking up your study sessions by taking small breaks is equally important. 

Table of Contents

The CBSE Class 8 Science Examination comprises multiple-choice questions, short-answer questions, and long-answer questions. The paper assesses the students' conceptual knowledge and parameters like knowledge application and problem-solving.

Practical work in science forms an intrinsic part, this enables students to put theoretical knowledge into practice, develop scientific inquiry skills, and gain hands-on experience with experiments. Practical activities deepen understanding and enhance problem-solving ability.

In solving numerical problems in Class 8 Science, you should start by carefully reading the problem and identifying the key information given in the problem. Note down the relevant formulae and solve the problem in a stepwise manner, showing all your steps.

• CBSE Study Material
• CBSE Important Questions
• Important Questions For Class 8 Science

CBSE Important Questions for Class 8 Science

CBSE Important Questions for Class 8 Science help students face the exams confidently. As the exam nears, they should complete the syllabus and start with the revision. The CBSE Important Questions for Class 8 Science will help them revise the subject quickly. Here, we have compiled the important questions for all the chapters of the CBSE Class 8 Science subject. By solving them, students will understand the types of questions asked in the exam. All types of questions are provided for students’ practice from basic to high level. CBSE Class 8 Science is a fascinating subject and includes interesting topics, thus providing basic knowledge about light, current, force, human beings, etc. Solving these CBSE Class 8 Science Important Questions is the best way to revise the major concepts of the subject.

The subject experts created the questions based exclusively from the exam perspective. Students must start solving them at least 20 days before the annual exam. By doing so, they will be able to analyse their weak areas and work on them. Practising the CBSE Important Questions will improve their performance and overall score in CBSE Class 8 Science exam.

There is a total of 18 chapters in NCERT Class 8 Science book. In the table below, we have provided the Important Questions for CBSE Class 8 Science for all the chapters. We have also included all types of questions, i.e. very short, short and long answers. These questions will cover all the crucial topics and the CBSE Class 8 Science syllabus.

How to Practise the CBSE Class 8 Science Important Questions

• Practise the question of a particular chapter in one go.
• Refrain from looking for the answer while solving the questions.
• Allocate a time duration for solving the questions and try to finish it accordingly.
• After completing all the questions, do a self-evaluation.
• Go through those questions again that could not be solved.

We, at BYJU’S, also provide other study materials such as CBSE Class 8 Science sample papers , notes, exemplars, solutions, etc.

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Home » Extras » Class 8 Science Competency Based Questions 2024-25: Download PDF

Class 8 Science Competency Based Questions 2024-25: Download PDF

Class 8 Science Competency Based Questions are available for download here on aglasem.com. These Class 8 Competency Based Questions include MCQs, fill in the blanks, short answer questions, long answer questions, and answer key from the Science curriculum and need you to apply understanding a little beyond the 8th class Science textbook. For CBSE students, understanding and mastering these questions is crucial for success in Science exam. Here you will understand what Competency Based Questions for Science are, how they differ from traditional questions, and get tips on tackling these questions. You can also download Class 8 Competency Based Questions Science PDF .

Class 8 Science Competency Based Questions 2024-25

Here you can access a wide array of CBSE Competency Based Questions for the Science subject. The PDF includes Multiple Choice Questions, Fill in the Blanks, Short Answer Questions, and Long Answer Questions, along with the answer key for class 8 Science. The Competency Based Questions for Class 8 Science can be found here.

Class 8 Science Competency Focused Practice Questions Download Link – Click Here to Download 8 Science CBQ PDF

Class 8 Science Competency Based Questions PDF

The complete pdf for competency focused practice questions for Science is as follows.

What are Science Competency Based Questions?

These are designed to evaluate a student’s understanding of concepts of Science, their ability to apply knowledge in real-life situations, and their critical thinking skills. Unlike traditional questions that may focus on rote learning or memorization, Competency Focused Questions require students to demonstrate a deeper comprehension of the subject matter (Science). These questions measure various competencies in the Science subject, such as problem-solving, logical reasoning, creativity, and subject-specific skills.

For Class 8 Competency Based Questions of Science , students are expected to think beyond the Science textbook and demonstrate their skills in a way that aligns with real-world applications.

• Class 8 Competency Based Questions

In addition to Science, the Competency Focused Questions for all subjects for students in 8th standard are as follows.

Other Classes CBQ Download Links

Similarly the class wise CBQ practice question bank for school board are as follows.

• Class 3 Competency Based Questions
• Class 4 Competency Based Questions
• Class 5 Competency Based Questions
• Class 6 Competency Based Questions
• Class 7 Competency Based Questions
• Class 9 Competency Based Questions
• Class 10 Competency Based Questions

Class 8 Science Competency Questions  – An Overview

The highlights of this educational resource are as follows.

Competency Based Questions are revolutionizing the way students approach their studies. By focusing on the core competencies required by the CBSE board, students in Class 8 can develop the skills necessary to excel academically and beyond. Whether you are dealing with Class 8 Science Competency Based Questions or any other subject, remember to focus on understanding, application, and critical thinking.

Start practicing today, and make these questions a core part of your study strategy. The more you engage with these questions, the more confident you’ll become in your ability to tackle any challenge that comes your way!

If you have any queries on 8th Science Specimen Paper 2025, then please ask in comments below.

To get study material, exam alerts and news, join our Whatsapp Channel .

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Case Study Based Questions: Microorganisms: Friend or Foe | Science Class 8 PDF Download

Case Study 1

You have seen several kinds of plants and animals. However, there are other living organisms around us which we normally cannot see. These are called microorganisms or microbes. For example, you might have observed that during the rainy season moist bread gets spoilt and its surface gets covered with greyish white patches. Observe these patches through a magnifying glass. You will see tiny, black rounded structures. Do you know what these structures are and where do these come from? Water and soil are full of tiny organisms, though not all of them fall into the category of microbes. These microorganisms or microbes are so small in size that they cannot be seen with the unaided eye. Some of these, such as the fungus that grows on bread, can be seen with a magnifying glass. Others cannot be seen without the help of a microscope. That is why these are called microorganisms or microbes. Microorganisms are classified into four major groups. These groups are bacteria, fungi, protozoa and some algae. Viruses are also microscopic but are different from other microorganisms. They, however, reproduce only inside the cells of the host organism, which may be a bacterium, plant or animal. Common ailments like cold, influenza (flu) and most coughs are caused by viruses. Serious diseases like polio and chickenpox are also caused by viruses. Diseases like dysentery and malaria are caused by protozoa(protozoans)whereas typhoid and tuberculosis (TB)are bacterial diseases. You have learnt about some of these microorganisms in Classes VI and VII. Microorganisms may be single-celled like bacteria, some algae and protozoa, or multicellular, such as many algae and fungi. They live in all types of environments, ranging from ice cold climate to hot springs; and deserts to marshy lands. They are also found inside the bodies of animals including humans. Some microorganisms grow on other organisms while others exist freely.

Q1: …………………………………. only reproduce inside the cells of host organisms like bacteria, plants, or animals. (a) Microbes (b) Viruses (c) Spores (d) Bacillus Ans: (b)

Q2: Which among the following is an example of a disease caused by bacteria? (a) Flu (b) Malaria (c) Tuberculosis (d) Covid 19 Ans: (c)

Q3: During the rainy season, moist bread gets spoiled and is covered with greyish white patches. What are these greyish white patches? (a) Bacteria (b) Viruses (c) Dirt (d) Fungus Ans: (d)

Q4: Define microorganisms and state its major groups of classification. Ans: Microorganisms are tiny living organisms that cannot be seen with our naked eyes. Microorganisms are classified into four major groups: bacteria, fungi, protozoa, and some algae.

Q5: Explain in detail where microorganisms are commonly found. Ans: Microorganisms are present in all types of environments ranging from ice-cold climates to hot springs, deserts, and marshy lands. They can also be seen inside the bodies of animals. Some microorganisms exist freely, and some grow on other organisms.

Case study 2

Microorganisms are used for various purposes. They are used in the preparation of curd, bread and cake. Microorganisms have been used for the production of alcohol since ages. They are also used in cleaning up of the environment. For example, the organic wastes (vegetable peels, remains of animals, faeces, etc.) are broken down into harmless and usable substances by bacteria. Recall that bacteria are also used in the preparation of medicines. In agriculture they are used to increase soil fertility by fixing nitrogen. You have learnt in Class VII that milk is turned into curd by bacteria. Curd contains several micro-organisms. Of these, the bacterium, Lactobacillus promotes the formation of curd. It multiplies in milk and converts it into curd. Bacteria are also involved in the making of cheese, pickles and many other food items. An important ingredient of rava (sooji )idlis and bhatur as is curd. Can you guess why? Bacteria and yeast are also helpful for fermentation of rice idlis and dosa batter. Kneading of Yeast and sugar into the flour causes the flour to rise and double in size. Yeast reproduces rapidly and produces carbon dioxide during respiration. Bubbles of the gas fill the dough and increase its volume. This is the basis of the use of yeast in the baking industry for making breads, pastries and cakes. Commercial Use of Microorganisms: Microorganisms are used for the large-scale production of alcohol, wine and acetic acid(vinegar).

Yeast is used for commercial production of alcohol and wine. For this purpose, yeast is grown on natural sugars present in grains like barley, wheat, rice, crushed fruit juices, etc. Adding a spoon full of yeast powder into sugar solution gives out a characteristic smell after few hours. This is the smell of alcohol as sugar has been converted into alcohol by yeast. This process of conversion of sugar into alcohol is known as fermentation. Louis Pasteur discovered fermentation in 1857.

Q1: In the process of fermentation, the sugar is converted into………………………….. (a) Vinegar (b) Curd (c) Salt (d) Alcohol Ans: (d)

Q2: Name the bacterium which, when added to milk, multiplies in it and converts milk into curd? (a) Lactobacillus (b) Streptococcus (c) Salmonella (d) Vibrio Ans: (a)

Q3: Louis Pasteur, a French chemist, in 1857 discovered the process of ………………………….? (a) Fermentation (b) Pollination (c) Saturation (d) Composting Ans: (a)

Q4: Explain the process of doubling of flour after the addition of yeast into it. Ans: After adding yeast and sugar into the flour, the yeast reproduces rapidly and produces carbon dioxide during respiration. Bubbles of gas fill the dough, causing the volume of dough to double in size.

Q5: Name some of the common uses of microorganisms. Ans: Microorganisms are useful for various purposes, such as in the preparation of curd, bread, and cake. They are used in the production of alcohol as well as medicines. Additionally, microorganisms are used to increase the fertility of the soil.

Case study 3

Whenever you fall ill the doctor may give you some antibiotic tablets, capsules or injections such as of penicillin. The source of these medicines is microorganisms. These medicines kill or stop the growth of the disease-causing microorganisms. Such medicines are called antibiotics. These days a number of antibiotics are being produced from bacteria and fungi. Streptomycin, tetracycline and erythromycin are some of the commonly known antibiotics which are made from fungi and bacteria. The antibiotics are manufactured by growing specific microorganisms and are used to cure a variety of diseases. Antibiotics are even mixed with the feed of livestock and poultry to check microbial infection in animals. They are also used to control many plant diseases. In 1929, Alexander Fleming was working on a culture of disease- causing bacteria. Suddenly he found the spores of a little green mould in one of his culture plates. He observed that the presence of mould prevented the growth of bacteria. In fact, it also killed many of these bacteria. From this the mould penicillin was prepared. When a disease-carrying microbe enters our body, the body produces antibodies to fight the invader. The body also remembers how to fight the microbe if it enters again. If dead or weakened microbes are introduced into a healthy body, the body fights and kills the invading bacteria by producing suitable antibodies. The antibodies remain in the body and we are protected from the disease-causing microbes for ever. This is how a vaccine works. Several diseases, including cholera, tuberculosis, smallpox and hepatitis can be prevented by vaccination. Edward Jenner discovered the vaccine for small- pox in 1798.In your childhood, you must have been given injections to protect yourself against several diseases. Can you prepare a list of these diseases? You may take help from your parents.

It is essential to protect all children against these diseases. Necessary vaccines are available in the nearby hospitals. You might have seen the advertisement on TV and newspapers regarding protection of children against polio under the Pulse Polio Programme. Polio drops given to children are actually a vaccine. A worldwide campaign against smallpox has finally led to its eradication from most parts of the world. These days vaccines are made on a large scale from microorganisms to protect humans and other animals from several diseases.

Q1: Which among the following scientists discovered the vaccine for Smallpox in 1798? (a) Edward Jenner (b) Alexander Fleming (c) Carl Linnaeus (d) Rosalind Franklin Ans: (a)

Q2: When a disease-carrying microbe enters our body, the body produces ……………………………………………………………………………… to fight against it. (a) Soldiers (b) Antibodies (c) Viruses (d) Bacteria Ans: (b)

Q3: In which year did Alexander Fleming, a Scottish physician, discover penicillin? (a) 1932 (b) 1987 (c) 1947 (d) 1929 Ans: (d)

Q4: Define antibiotics and give their uses. Ans: Antibiotics are medicines produced from microorganisms that kill or stop the growth of disease-causing microorganisms. Some common examples include streptomycin, tetracycline, and erythromycin. They are used to cure a variety of human and plant diseases and also to check microbial infections in animals.

Q5: Name some of the diseases that can be prevented by taking vaccination. Ans: Some diseases that can be prevented by vaccination are cholera, tuberculosis, smallpox, and hepatitis.

Case study 4

Microorganisms are harmful in many ways. Some of the microorganisms cause diseases in human beings, plants and animals. Such disease-causing microorganisms are called pathogens. Some microorganisms spoil food, clothing and leather. Let us study more about their harmful activities. Pathogens enter our body through the air we breathe, the water we drink or the food we eat. They can also get transmitted by direct contact with an infected person or carried by an animal. Microbial diseases that can spread from an infected person to a healthy person through air, water, food or physical contact are called communicable diseases. Examples of such diseases include cholera, common cold, chickenpox and tuberculosis. When a person suffering from common cold sneezes, fine droplets of moisture carrying thousands of viruses are spread in the air. The virus may enter the body of a healthy person while breathing and cause infection. There are some insects and animals which act as carriers of disease-causing microbes. Housefly is one such carrier. The flies sit on the garbage and animal excreta. Pathogens stick to their bodies. When these flies sit on uncovered food, they may transfer the pathogens. Whoever eats the contaminated food is likely to get sick. So, it is advisable to always keep food covered. Avoid consuming uncovered items of food. Another example of a carrier is the female Anopheles mosquito, which carries the parasite of malaria(Plasmodium). Female Aedes mosquito acts as carrier of dengue virus. How can we control the spread of malaria or dengue? All mosquitoes breed in water. Hence, one should not let water collect any where, in coolers, tyres, flower pot, etc. By keeping the surroundings clean and dry we can prevent mosquitoes from breeding. Try to make a list of measures which help to avoid the spread of malaria. Several microorganisms not only cause diseases in humans and plants, but also in other animals. For example, anthraxis a dangerous human and cattle disease caused by a bacterium. Foot and mouth disease of cattle is caused by a virus. Robert Köch(1876) discovered the bacterium(Bacillus anthracis) which causes anthrax disease. Several microorganisms cause diseases in plants like wheat, rice, potato, sugarcane, orange, apple and others. The diseases reduce the yield of crops. They can be controlled by the use of certain chemicals which kill the microbes.

Q1: Disease-causing microorganisms are called …………………………….. (a) Antibodies (b) Macrophages (c) Pathogens (d) Eosinophils Ans: (c)

Q2: Which among the following insects acts as the carrier of the dengue virus? (a) Female Anopheles (b) Female Aedes (c) Female Culex (d) Ochlerotatus Ans: (b)

Q3: Robert Koch in 1876 discovered the bacterium (Bacillus anthracis) which causes……………………….. disease. (a) Anthrax (b) Malaria (c) Chikungunya (d) Cholera Ans: (a)

Q4: Define the term “communicable diseases” with some examples. Ans: Communicable diseases are microbial diseases that can spread from an infected person to a healthy person through air, water, food, or physical contact. Examples include cholera, common cold, chickenpox, and tuberculosis.

Q5: How can we control the spread of diseases caused by mosquitoes? Ans: The breeding of mosquitoes occurs in water. Therefore, controlling the spread of such diseases involves preventing water from collecting in our surroundings, such as in coolers, tyres, flower pots, etc., and keeping the environment clean and dry.

Case study 5

How do we preserve cooked food at home? You know that bread left unused under moist conditions is attacked by fungus. Microorganisms spoil our food. Spoiled food emits bad smell and has a bad taste and changed colour. Is spoiling of food a chemical reaction? Paheli bought some mangoes but she could not eat them for a few days. Later she found that they were spoilt and rotten. But she knows that the mango pickles that her grandmother makes does not spoil for a long time. She is confused. Let us study the common methods of preserving food in our homes. We have to save it from the attack of microorganisms. Chemical Method: Salts and edible oils are the common chemicals generally used to check the growth of microorganisms. Therefore, they are called preservatives. We add salt or acid preservatives to pickles to prevent the attack of microbes. Sodium benzoate and sodium metabisulphite are common preservatives. These are also used in jams and squashes to check their spoilage. Preservation by Common Salt: Common salt has been used to preserve meat and fish for ages. Meat and fish are covered with dry salt to check the growth of bacteria. Salting is also used to preserve amla, raw mangoes, tamarind, etc. Preservation by Sugar: Jams, jellies and squashes are preserved by sugar. Sugar reduces the moisture content which inhibits the growth of bacteria which spoil food. Preservation by Oil and Vinegar: Use of oil and vinegar prevents spoilage of pickles because bacteria cannot live in such an environment. Vegetables, fruits, fish and meat are often preserved by this method. Heat and Cold Treatments: You must have observed your mother boiling milk before it is stored or used. Boiling kills many microorganisms. Similarly, we keep our food in the refrigerator. Low temperature inhibits the growth of microbes. Pasteurised milk can be consumed without boiling as it is free from harmful microbes.

The milk is heated to about 700C for 15 to 30 seconds and then suddenly chilled and stored. By doing so, it prevents the growth of microbes. This process was discovered by Louis Pasteur. It is called pasteurisation. Storage and Packing: These days dry fruits and even vegetables are sold in sealed air tight packets to prevent the attack of microbes.

Q1: Which of the following is NOT an example of a chemical method of preservation? (a) Salt (b) Heating (c) Sodium Benzoate (d) Sodium Metabisulphite Ans: (b)

Q2: ……………. of milk before storing is done to kill many microorganisms. (a) Mixing (b) Distilling (c) Baking (d) Boiling Ans: (d)

Q3: Pasteurisation technique was discovered by which of the following scientists? (a) Louis Pasteur (b) Fanny Hesse (c) Ronald Ross (d) Harold Ginsberg Ans: (a)

Q4: Explain the process of pasteurization in detail. Ans: In the pasteurization process, milk is heated to about 70°C for 15 to 30 seconds and then suddenly chilled and stored. This process prevents the growth of microbes and extends the shelf life of the milk.

Q5: Name some of the common methods of food preservation at your home. Ans: Some common methods of preservation include adding common salt to pickles, meat, and fish; using sugar; and preserving with oil and vinegar.

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Case Study Questions Class 8 Science Reaching the age of adolescence

Case study questions class 8 science chapter 10 reaching the age of adolescence.

CBSE Class 8 Case Study Questions Science Reaching the age of adolescence. Important Case Study Questions for Class 8 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Reaching the age of adolescence.

CBSE Case Study Questions Class 8 Science Reaching the age of adolescence

Case study 1.

Que. 1) The protruding part of the throat usually seen in boys that is responsible for deep voice is known as?

(b) Swollen lymph

(a) Broader shoulder

Que. 2) (d) Region below waist wider

Que. 3) (a) Ovaries

Case study 2

Que. 1) Sex hormones are under the control of hormones from the ………………………………………………………………………………….. gland.

(c) Thyroid

(a) Superficial glands

(b) Doubtful glands

Case study 3

Que. 1) The first menstrual flow begins at puberty and is termed as ………………………………………………………………………………………. .

(d) Menarche

Que. 4) Explain in detail the process of menstruation.

Que. 4)Answer: In about 28-30 days, one ovum maturesand is released from the ovary. Walls of the uterus are thickened to receive the ovum. If fertilisation of that ovum does not occur, the released ovum along with the thickened lining and its blood vessels are shed off causing bleeding.

Que. 3) In a person suffering from Diabetes, the pancreas does not produce …………………………………………………………………………………….. hormone in sufficient quantity.

(d) Melatonin

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Environmental impacts of extensive beef production in Colombia by life cycle assessment: a case study

• Research Article
• Published: 07 September 2024

Cite this article

• Sara Arcila 1 ,
• Natalia Correa 1 ,
• Sebastián Pachón 2 ,
• Luis Giraldo A. Valderrama 2 &
• Natalia A. Cano-Londoño   ORCID: orcid.org/0000-0003-4828-6442 3 , 4  

The increase in the negative effects of global change promotes the search for alternatives to supply the demand for food worldwide aligned with the Sustainable Development Goals (SDGs) to ensure food security. Animal protein, which is a main source of nutrients in the diet of today’s society, especially beef, which is one of the most demanded products nowadays, has been criticized not only for its high water consumption and land occupation for production but also for the emission of greenhouse gases (GHG) from enteric methane generated in the fermentation process within the bovine rumen and deforestation for the adaptation of pastures. This study is mainly motivated by the lack of quantifiable scientific information in Colombia on the environmental impacts of beef production. Therefore, it is intended to estimate some of the impacts of beef production in extensive systems using the life cycle assessment (LCA) method under a particular scenario considering all the production phases (from raw material to fattening, where the cattle are ready to be slaughtered). The study was conducted with data supplied by a farm in Antioquia, Colombia, and the functional unit (FU) was defined as 1 kg of live weight (LW). The scope of this study was gate-to-gate. “The 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories” (IPCC  2006 ; IPCC 2019 ) was used to calculate methane and nitrous oxide emissions. LCA modeling was developed with Ecoinvent database v3.8 and the Umberto LCA + software. It was found that the most affected category of damage was ecosystem quality, which represents 77% of the total, followed by human health at 17% and resources at 6%. The category impact of agricultural land occupation is the one that represents the most significant contribution to the ecosystem quality endpoint, with a percentage of 87%, due to the soil’s compaction and the loss of the soil’s properties. Additionally, the obtained carbon footprint for the system was 28.9 kg of CO 2 -eq/kg LW.

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Acknowledgements

To the coauthors for their expertise and assistance throughout all aspects of our study and for their help in writing the manuscript.

To research group BIORUM of the Science Faculty of the National University of Colombia.

To research group Fenómenos de Superficie-Michael Polanyi of the Mining Faculty of the National University of Colombia.

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Sara Arcila & Natalia Correa

Grupo de Investigación BIORUM, Facultad de Ciencias Agrarias, Universidad Nacional de Colombia−Sede Medellín, 050041, Medellín, Colombia

Sebastián Pachón & Luis Giraldo A. Valderrama

Grupo de Investigación en Fenómenos de Superficie-Michael Polanyi, Facultad de Minas, Universidad Nacional de Colombia−Sede Medellín, 050041, Medellín, Colombia

Natalia A. Cano-Londoño

Research Group Sustainable Systems Engineering (STEN), Ghent University, Coupure Links 653, 9000, Ghent, Belgium

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All authors contributed to the study’s conception and design. Sara Arcila, Natalia Correa, and Sebastián Pachón prepared materials, collected data, and analyzed them. Natalia A. Cano-Londoño and Luis Giraldo-Valderrama supervised them. Natalia Correa and Sebastián Pachón wrote the first draft of the manuscript, and all authors commented on previous versions. All authors read and approved the final manuscript.

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• Enteric methane emissions from manure management and direct/indirect nitrous oxide emissions from manure and soil management were calculated for suckling calves, growing, breeding stock, and fattening phases.

• LCA allows analyzing the environmental impacts of livestock farming in Colombia, which may not have been previously considered.

• This LCA supports environmental decision-making and formulating sustainable livestock policies and projects of best agricultural practices.

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Arcila, S., Correa, N., Pachón, S. et al. Environmental impacts of extensive beef production in Colombia by life cycle assessment: a case study. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-34463-8

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DOI : https://doi.org/10.1007/s11356-024-34463-8

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• Resources and Development Class 10 Case Study Social Science Geography Chapter 1

Last Updated on September 3, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 10 social science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 10 social science. In this article, you will find case study for CBSE Class 10 Social Science Geography Chapter 1 Resources and Development. It is a part of Case Study Questions for CBSE Class 10 Social Science Series.

Table of Contents

Case Study Questions on Resources and Development Class 10

Read the following passage and answer the questions:

We have shared our land with the past generations and will have to do so with the future generations too. Ninety five per cent of our basic needs for food, shelter and clothing are obtained from land.

Human activities have not only brought about degradation of land but have also aggravated the pace of natural forces to cause damage to land. Some human activities such as deforestation, overgrazing, mining and quarrying too have contributed significantly in land degradation. Mining sites are abandoned, after excavation work is complete, leaving deep scars and traces of over burdening. In states like Jharkhand, Chhattisgarh, Madhya Pradesh and Odisha, deforestation due to mining have caused severe land degradation. In states like Gujarat, Rajasthan, Madhya Pradesh and Maharashtra, over-grazing is one of the main reasons for land degradation. In the states like Punjab, Haryana, Western Uttar Pradesh, over irrigation is responsible for land degradation due to water logging leading to increase in salinity and alkalinity in the soil.

Q 1. How does human activities have brought about land degradation? Ans. Human activities have brought about land degradation through the factors like deforestation, over-grazing, mining and quarrying.

Q 2. How is over irrigation responsible for land degradation? Ans. Over irrigation is responsible for land degradation due to water logging leading to increase in salinity in soil.

Q 3. Why is human considered as the main culprit for land degradation? Ans. Human is considered as the main culprit for land degradation due to the following reasons: (i) His excavation work at mining sites. (ii) His significant contribution to deforestation. (iii) He has aggravated the pace of natural forces causing damage to land. (Any two)

Planning is the widely accepted strategy for judicious use of resources. It has importance in a country like India, which has enormous diversity in the availability of resources. There are regions which are rich in certain types of resources but are deficient in some other resources. There are some regions which can be considered self-sufficient in terms of the availability of resources and there are some regions which have acute shortage of some vital resources. For example, the states of Jharkhand, Chhattisgarh and Madhya Pradesh are rich in minerals and coal deposits. Arunachal Pradesh has abundance of water resources but lacks in infrastructural development. The state of Rajasthan is very well endowed with solar and wind energy but lacks in water resources. The cold desert of Ladakh is relatively isolated from the rest of the country. It has very rich cultural heritage, but it is deficient in water, infrastructure and some vital minerals. This calls for balanced resource planning at the national, state, regional and local levels.

Q. 1. Which of the following statements correctly describes about resource planning? a. Identification and quantification of available resources. b. Development of available resources. c. Both a. and b. d. Uneven distribution of resources.

Ans. Option (c) is correct.

Q. 2. Resource planning is important in a country like India due to: a. enormous diversity in availability of resources b. deficiency in certain types of resources c. abundance of water resources d. rich cultural heritage

Ans. Option (a) is correct.

Q. 3. The state(s) which is/are rich in minerals and coal deposits is/are: a. Jharkhand b. Chhattisgarh c. Madhya Pradesh d. All of these

Ans. Option (d) is correct.

Q. 4. The states like Jharkhand, Madhya Pradesh are rich in coal and minerals but have less development in resources as: a. they are economically less developed b. they have rich cultural heritage c. they lack water resources d. they lack technological and institutional support

• Power Sharing Class 10 Case Study Social Science Political Science Chapter 1
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• The Making of a Global World Class 10 Case Study Social Science History Chapter 3

Nationalism in India Class 10 Case Study Social Science History Chapter 2

The rise of nationalism in europe class 10 case study social science history chapter 1, topics from which case study questions may be asked.

• Types – natural and human
• Need for resource planning
• Natural resources
• Land as a resource
• Soil types and distribution
• Changing land-use pattern
• Land degradation and conservation measures.

Everything available in our environment which can be used to satisfy our needs, provided it is technologically accessible, economically feasible and culturally acceptable, can be termed as ‘resource’.

The first International Earth Summit held in Rio de Janeiro in 1992 endorsed global Forest Principles and adopted Agenda 21 for achieving sustainable development.

Frequently Asked Questions (FAQs) on Resources and Development Class 10 Case Study

Q1: what are case study questions.

A1: Case study questions are a type of question that presents a detailed scenario or a real-life situation related to a specific topic. Students are required to analyze the situation, apply their knowledge, and provide answers or solutions based on the information given in the case study. These questions help students develop critical thinking and problem-solving skills.

Q2: How should I approach case study questions in exams?

A2: To approach case study questions effectively, follow these steps: Read the case study carefully: Understand the scenario and identify the key points. Analyze the information: Look for clues and relevant details that will help you answer the questions. Apply your knowledge: Use what you have learned in your course to interpret the case study and answer the questions. Structure your answers: Write clear and concise responses, making sure to address all parts of the question.

Q3: What are the benefits of practicing case study questions from your website?

A3: Practicing case study questions from our website offers several benefits: Enhanced understanding: Our case studies are designed to deepen your understanding of historical events and concepts. Exam preparation: Regular practice helps you become familiar with the format and types of questions you might encounter in exams. Critical thinking: Analyzing case studies improves your ability to think critically and make connections between different historical events and ideas. Confidence: Practicing with our materials can boost your confidence and improve your performance in exams.

Q4: What are the important keywords in this chapter “Resources and Development”?

A4: Important keywords for CBSE Class 10 Resources and Development are given below: Land Use Pattern: Use of land for different purposes like forests, cultivation, fallow land, etc. Ecological Balance: The balance in our physical and cultural environment. Man’s activities cause disturbances in this balance. For example, two important aspects are balance of gases in air and balance of constituents in soil. Land Degradation: Depletion of the resources of the land through soil erosion, mining, deforestation, etc. Khadar: The new alluvium. Kankar: Substance now containing calcium carbonates. Laterite: Soils from which silicates have been leached out and iron and aluminium predominate. Bangar: The old alluvium. Conservation: Preservation and protection of natural or man-made resources. Regur: Black soil of extremely fine clayey material. Basin: A wide depression or an area drained by a river. Sub-soil: Part of the soil below the top layer, normally used for cultivation to the depth to which most plant roots grow. Fallow Land: Agricultural land left uncultivated after two-three crops to restore its natural fertility. Marginal Land: Land which is difficult to cultivate and yields little profit. Net Sown Area: The total land under crop production excluding wasteland or land left fallow. Soil: Top layer of earth containing humus.

Q5: When and why was the Rio-de-Janeiro Earth summit held?

A5: Rio-de-Janeiro summit was held in 1992 in Brazil. Earth Summit: To achieve sustainable development in order to combat environment damage, poverty and disease, it laid emphasis on global cooperation, mutual needs and shared responsibilities.

Q6: What type of soil is found in the river deltas of the eastern coast? Write three main features of this type of soil.

A6: Alluvial Soil: Its main features are: (i) Mostly these soils contain adequate proportion of potash and lime which are ideal for the growth of sugarcane, paddy, wheat, etc. (ii) Such a soil is the result of deposits of river. (iii) Very fertile soil

Q7: What do you mean by land use pattern? Name the factors that determine the use of land.

A7: Utilisation of land for various purposes, such as cultivation, grazing of animals, mining, construction of roads, etc. Factors that determine land use pattern are: (i) Topography (ii) Climate (iii) Human Factor (iv) Accessibility

Q8: What does the term ‘sustainable economic development’ mean? How can we eradicate irrational consumption and over-utilisation of resources?

A8: Sustainable economic development means ‘development should take place without damaging the environment’ and development in the present should not compromise with the needs of the future generations. We can eradicate irrational consumption and over-utilisation of resources through conservation of resources. Irrational consumption and over-exploitation of resources lead to many socioeconomic and environmental problems. To overcome these problems and to preserve resources for our future generation as well, proper management and conservation of resources is essential

Q9: What is resource planning? Write three phases of resource planning.

A9: Resource planning is a proper and judicious planning of resources. Resources are put to use according to availability and needs for development of the economy. Three processes which are involved in resource planning are: (a) Identification and inventory of resources across various regions of the country. It involves surveying, mapping, qualitative and quantitative estimation and measurement of the resources. (b) Evolving a planning structure, endowed with appropriate technological skill and institutional set up for implementing resource development plans. (c) Synchronizing the resource development with overall national development plans.

Q10: Explain the role of human in resource development

A10: Human is at the centre of resource development. Actually all resources become resources only when they are put to use by humans. It is human who makes natural things usable with the help of technology. Had no technology been there, development would not have been possible. There are regions where natural resources are in abundance but the regions are not developed, e.g., Africa. But if humans are developed, they make the region developed with technology, e.g., Japan.

Q11: Are there any online resources or tools available for practicing “ Resources and Development” case study questions?

A11: We provide case study questions for CBSE Class 10 Social Science on our  website . Students can visit the website and practice sufficient case study questions and prepare for their exams.

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Case Study Questions for Class 8 Science Chapter 13 Sound

• Last modified on: 1 year ago
• Reading Time: 4 Minutes

Here we are providing case study questions for CBSE Class 8 Science Chapter 13 Sound.

Case Study Questions

Question 1:

Sound plays an important role in our life. It is a form of energy which makes us hear . Vibrating objects produce sound. Vibration is the to and fro or back and forth movement of an object. Sound needs a medium to travel. Hence, it cannot travel in a vacuum.

Human beings have a voice box or larynx which is present in their throat on the upper side of the windpipe. The larynx has two vocal cords which have a narrow slit between them so that air can pass through it. As the lungs throw the air out of the windpipe, it passes through the slit and hence allows the production of sound as the vocal cords start vibrating. Since sound travels in the form of waves, it is important to study about characteristics of waves. The three main properties of waves are Amplitude, frequency, and time period.

The magnitude of disturbance in the medium on either side of the mean value is called as Amplitude(A). Larger the amplitude, louder the sound. The number of oscillations/vibrations per second is called frequency. which is expressed in Hertz (Hz). Time taken for one complete oscillation/vibration is the time period.

i) Which part of the human throat is responsible for the voice produced by a human?

ii) The form of energy which enable us to hear:

iii) The rapid to and fro or up and down movement of an object from its mean position:

iv) The maximum displacement of a vibrating object from its mean position:

iii) Vibration

iv) Amplitude

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