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Class 9 Science Case Study Questions

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If you are wondering how to solve class 9 science case study questions, then myCBSEguide is the best platform to choose. With the help of our well-trained and experienced faculty, we provide solved examples and detailed explanations for the recently added Class 9 Science case study questions.

You can find a wide range of solved case studies on myCBSEguide, covering various topics and concepts. Class 9 Science case studies are designed to help you understand the application of various concepts in real-life situations.

The rationale behind Science

Science is crucial for Class 9 students’ cognitive, emotional, and psychomotor development. It encourages curiosity, inventiveness, objectivity, and aesthetic sense.

In the upper primary stage, students should be given a variety of opportunities to engage with scientific processes such as observing, recording observations, drawing, tabulating, plotting graphs, and so on, whereas in the secondary stage, abstraction and quantitative reasoning should take a more prominent role in science teaching and learning. As a result, the concept of atoms and molecules as matter’s building units, as well as Newton’s law of gravitation, emerges.

Science is important because it allows Class 9 Science students to understand the world around us. It helps to find out how things work and to find solutions to problems at the Class 9 Science level. Science is also a source of enjoyment for many people. It can be a hobby, a career, or a source of intellectual stimulation.

Case study questions in Class 9 Science

The inclusion of case study questions in Class 9 science CBSE is a great way to engage students in critical thinking and problem-solving. By working through real-world scenarios, Class 9 Science students will be better prepared to tackle challenges they may face in their future studies and careers. Class 9 Science Case study questions also promote higher-order thinking skills, such as analysis and synthesis. In addition, case study questions can help to foster creativity and innovation in students. As per the recent pattern of the Class 9 Science examination, a few questions based on case studies/passages will be included in the CBSE Class 9 Science Paper. There will be a paragraph presented, followed by questions based on it.

Examples of Class 9 science class case study questions

Class 9 science case study questions have been prepared by myCBSEguide’s qualified teachers. Class 9 case study questions are meant to evaluate students’ knowledge and comprehension of the material. They are not intended to be difficult, but they will require you to think critically about the material. We hope you find Class 9 science case study questions beneficial and that they assist you in your exam preparation.

The following are a few examples of Class 9 science case study questions.

Class 9 science case study question 1

• due to its high compressibility
• large volumes of a gas can be compressed into a small cylinder
• transported easily
• all of these
• shape, volume
• volume, shape
• shape, size
• size, shape
• the presence of dissolved carbon dioxide in water
• the presence of dissolved oxygen in the water
• the presence of dissolved Nitrogen in the water
• liquid particles move freely
• liquid have greater space between each other
• both (a) and (b)
• none of these
• Only gases behave like fluids
• Gases and solids behave like fluids
• Gases and liquids behave like fluids
• Only liquids are fluids

Answer Key:

• (d) all of these
• (a) shape, volume
• (b) the presence of dissolved oxygen in the water
• (c) both (a) and (b)
• (c) Gases and liquids behave like fluids

Class 9 science case study question 2

• 12/32 times
• 18 g of O 2
• 18 g of CO 2
• 18 g of CH 4
• 1 g of CO 2
• 1 g of CH 4 CH 4
• 2 moles of H2O
• 20 moles of water
• 6.022  ×  1023 molecules of water
• 1.2044  ×  1025 molecules of water
• (I) and (IV)
• (II) and (III)
• (II) and (IV)
• Sulphate molecule
• Ozone molecule
• Phosphorus molecule
• Methane molecule
• (c) 8/3 times
• (d) 18g of CH ​​​​​4
• (c) 1g of H ​​​​​​2
• (d) (II) and (IV)
• (c) phosphorus molecule

Class 9 science case study question 3

• collenchyma
• chlorenchyma
• It performs photosynthesis
• It helps the aquatic plant to float
• It provides mechanical support
• Sclerenchyma
• Collenchyma
• Epithelial tissue
• Parenchyma tissues have intercellular spaces.
• Collenchymatous tissues are irregularly thickened at corners.
• Apical and intercalary meristems are permanent tissues.
• Meristematic tissues, in its early stage, lack vacuoles, muscles
• (I) and (II)
• (III) and (I)
• Transpiration
• Provides mechanical support
• Provides strength to the plant parts
• None of these
• (a) Collenchyma
• (b) help aquatic plant to float
• (b) Sclerenchyma
• (d) Only (III)
• (c) provide strength to plant parts

Cracking Class 9 Science Case Study Questions

There is no one definitive answer to Class 9 Science case study questions. Every case study is unique and will necessitate a unique strategy. There are, nevertheless, certain general guidelines to follow while answering case study questions.

• To begin, double-check that you understand the Class 9 science case study questions. Make sure you understand what is being asked by reading it carefully. If you’re unclear, seek clarification from your teacher or tutor.
• It’s critical to read the Class 9 Science case study material thoroughly once you’ve grasped the question. This will provide you with a thorough understanding of the problem as well as the various potential solutions.
• Brainstorming potential solutions with classmates or other students might also be beneficial. This might provide you with multiple viewpoints on the situation and assist you in determining the best solution.
• Finally, make sure your answer is presented simply and concisely. Make sure you clarify your rationale and back up your claim with evidence.

A look at the Class 9 Science Syllabus

The CBSE class 9 science syllabus provides a strong foundation for students who want to pursue a career in science. The topics are chosen in such a way that they build on the concepts learned in the previous classes and provide a strong foundation for further studies in science. The table below lists the topics covered in the Class 9 Science syllabus of the Central Board of Secondary Education (CBSE). As can be seen, the Class 9 science syllabus is divided into three sections: Physics, Chemistry and Biology. Each section contains a number of topics that Class 9 science students must study during the course.

CBSE Class 9 Science (Code No. 086)

Theme: Materials Unit I: Matter-Nature and Behaviour Definition of matter; solid, liquid and gas; characteristics – shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation. Nature of matter:  Elements, compounds and mixtures. Heterogeneous and homogenous mixtures, colloids and suspensions. Particle nature and their basic units:  Atoms and molecules, Law of constant proportions, Atomic and molecular masses. Mole concept: Relationship of mole to mass of the particles and numbers. Structure of atoms:  Electrons, protons and neutrons, valency, the chemical formula of common compounds. Isotopes and Isobars.

Theme: The World of the Living Unit II: Organization in the Living World Cell – Basic Unit of life:  Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles and cell inclusions; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes – basic structure, number. Tissues, Organs, Organ System, Organism: Structure and functions of animal and plant tissues (only four types of tissues in animals; Meristematic and Permanent tissues in plants).

Theme: Moving Things, People and Ideas Unit III: Motion, Force and Work Motion:  Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, derivation of equations of motion by graphical method; elementary idea of uniform circular motion. Force and Newton’s laws:  Force and Motion, Newton’s Laws of Motion, Action and Reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration. Elementary idea of conservation of Momentum. Gravitation:  Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall. Floatation:  Thrust and Pressure. Archimedes’ Principle; Buoyancy. Work, energy and power:  Work done by a Force, Energy, power; Kinetic and Potential energy; Law of conservation of energy. Sound:  Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo.

Theme: Food Unit IV: Food Production Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

PRESCRIBED BOOKS:

• Science-Textbook for class IX-NCERT Publication
• Assessment of Practical Skills in Science-Class IX – CBSE Publication
• Laboratory Manual-Science-Class IX, NCERT Publication
• Exemplar Problems Class IX – NCERT Publication

myCBSEguide: A true helper

There are numerous advantages to using myCBSEguide to achieve the highest results in Class 9 Science.

• myCBSEguide offers high-quality study materials that cover all of the topics in the Class 9 Science curriculum.
• myCBSEguide provides practice questions and mock examinations to assist students in the best possible preparation for their exams.
• On our myCBSEguide app, you’ll find a variety of solved Class 9 Science case study questions covering a variety of topics and concepts. These case studies are intended to help you understand how certain principles are applied in real-world settings
• myCBSEguide is that the study material and practice problems are developed by a team of specialists who are always accessible to assist students with any questions they may have. As a result, students may be confident that they will receive the finest possible assistance and support when studying for their exams.

So, if you’re seeking the most effective strategy to study for your Class 9 Science examinations, myCBSEguide is the place to go!

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• CBSE Class 9 Study Material

CBSE Class 9 Science Important Case Study Questions with Answers for Term 2 Exam 2022 (PDF)

Check important case study questions of cbse class 9 science to prepare for the cbse term 2 exam 2022. all these questions have been put together by subject experts..

CBSE Class 9 Term 2 Exam 2022:  Important case based questions for CBSE Class 9 Science are provided here students to prepare for the upcoming Term 2 Exam 2022. All the questions provided below are curated by the subject experts. These questions are really helpful to revise important concepts and prepare the case study questions for the exam. Answers to all questions have been provided for reference. So, students should practice the chapter-wise questions to clearly understand the right way to attempt the case based questions. Download the chapter-wise questions in PDF.

Check some of the important case study questions below:

Q. Read the following and answer the questions :

A student was asked by his teacher to verify the law of conservation of mass in the laboratory. He prepared 5% aqueous solutions of NaCl and Na 2 SO 4 . He mixed 10 mL of both these solutions in a conical flask. He weighed the flask on a balance. He then stirred the flask with a rod and weighed it after sometime. There was no change in mass.

• Was the student able to verify the law of conservation of mass?
• If not, what was the mistake committed by him?
• In your opinion, what he should have done?
• What is the molar mass of Na 2 SO 4 ?
• No, he could not verify the law of conservation of mass in-spite of the fact that there was no change in mass.
• No chemical reaction takes place between NaCl and Na 2 SO 4 . This means that no reaction actually took place in the flask.
• He should have performed the experiment by using aqueous solutions of BaCl 2 and Na 2 SO 4 . A chemical reaction takes place in this case and a white precipitate of BaSO 4 is formed.
• Will the weight of the precipitate be the same as that of the reactants before mixing?
• If not, what she should have done?
• Which law of chemical combination does this support?
• State the law of conservation of mass.
• No, it will not be the same.
• She should have weighed the total contents of the beaker after the reaction and not the precipitate alone.
• It supports the law of conservation of mass.
• Mass can neither be created nor destroyed during a chemical reaction.

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Case Study Questions Class 9 Science Matter in our Surroundings

Case study questions class 9 science chapter 1 matter in our surroundings.

CBSE Class 9 Case Study Questions Science Matter in our Surroundings. Important Case Study Questions for Class 9 Exam. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Matter in our Surroundings.

CBSE Case Study Questions Class 9 Science – Matter in our Surroundings

Case study 1:.

Answer the following questions by referring above paragraph.

ii.) Thoughts coming in our mind are example of matter. True or false

b.) Particles of matter are continuously moving

Case Study 2:

Solids have a definite shape, distinct boundaries and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid.

Gas has very low density hence are light. Gas can flow easily and hence are called fluid.

Case Study 3:

Particles start vibrating with greater speed. The energy supplied by heat overcomes the forces of attraction between the particles. The particles leave their fixed positions and start moving more freely. A stage is reached when the solid melts and is converted to a liquid. The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

c.) Boiling point

iv.) Define melting point and boiling point

Case Study 4:

d.) None of these

c.) They are light weight as compare to other particles

Case Study 5:

i.) Evaporation is surface phenomenon. True or false

c.) Does not have any effect from wind speed

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• Work and Energy Class 9 Case Study Questions Science Chapter 10

Last Updated on August 13, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 9 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 9 science. In this article, you will find case study questions for cbse class 9 science chapter 10 Work and Energy.

Table of Contents

Case Study Questions on Work and Energy

Question 1:

Work is said to be done when the force applied on an object produces a displacement of the object in the direction of force applied. For example, when we push or pull a heavy load or lift it above the floor then we are doing work, but a man carrying heavy load and standing still is not doing any work. Work, which is the product of force and displacement, has only magnitude and no direction. So, it is a scalar quantity.

Read the given passage carefully and give the answer of the following questions:

Q 1. A man raises a box of mass 50 kg to a height of 2 m in 10 s, while another man raises the same box to the same height in 50 s. What is the ratio of work done by them?

Difficulty Level: Medium

Q 2. If force and displacement of the particle (in direction of force) are doubled, what should be the amount of work?

Difficulty Level: Easy

Q 3. A coolie lifts a luggage of 10 kg from the ground and put it on his head 1.8 m above the ground. What would be the work done by him on the luggage?

Q 4. A student carries a bag weighing 5 kg from the ground floor to his class on the first floor that is 2 m high. What is the work done by the boy?

Q 5. Calculate the value of work done in holding a suitcase of 15 kg while waiting for a bus for 40 minutes.

1. We know that, $W=F \times s \Rightarrow$ Work done is independent of time taken. Hence, in both the cases, $W=$ $50 \times 10 \times 2=1000 \mathrm{~J}$ Thus, ratio of work done $=1000: 1000=1: 1$

2. The work should be 4 times.

3. Mass of luggage, $m=10 \mathrm{~kg}$ and displacement, $s=1.8 \mathrm{~m}$ Work done, $W=F \times s=m g \times s$ $$ =10 \times 10 \times 1.8=180 \mathrm{~J} $$

4. Here, mass of bag, $m=5 \mathrm{~kg}$ and displacement, $s=2 \mathrm{~m}$ Work done, $W=F \times s=m g \times s$ $$ =5 \mathrm{~kg} \times 10 \mathrm{~m} \mathrm{~s}^{-2} \times 2 \mathrm{~m}=100 \mathrm{~J} $$

5. Displacement in holding a suitcase while waiting for a bus, i.e., stationary position $=0$ $$ \begin{aligned} & \therefore \quad \text { Work done }=\text { force } \times \text { zero } \\ & \quad \Rightarrow \text { Work done }=\text { zero. } \end{aligned} $$

Case study questions for other chapters of class 9 science is given below.

• Gravitation Class 9 Case Study Questions Science Chapter 9
• Force and Laws of Motion Class 9 Case Study Questions Science Chapter 8
• Motion Class 9 Case Study Questions Science Chapter 7
• Tissues Class 9 Case Study Questions Science Chapter 6
• The Fundamental Unit of Life Class 9 Case Study Questions Science Chapter 5

Is Matter Around Us Pure Class 9 Case Study Questions Science Chapter 2

Matter in our surroundings class 9 case study questions science chapter 1.

We hope the given case study questions for Work and Energy Class 9 helps you in your learning.

Helpful Links for CBSE Class 9 Science Preparation

• Chapter Tests for CBSE Class 9 Science
• Worksheets for CBSE Class 9 Science
• 100 Important Numerical Problems for CBSE Class 9 Physics
• 65 Important Case Study Questions for CBSE Class 9 Science

Topics from which case study questions may be asked

• Work done by a Force
• Kinetic and Potential energy
• Law of conservation of energy (excluding commercial unit of Energy).

Work is said to be done when the force applied on the body displaces its position in the direction of the applied force.

Conditions for Work to be Done:

• A force should act on the body.
• The body must be displaced from its position.

Work Done by a Constant Force: It is the product of the force and the distance moved by the body in the direction of the applied force, i.e., W = F x s. It is a scalar quantity.

SI Unit of Work: The SI unit of work is Newton-metre (N-m) or Joule (J).

1 Joule: It is the amount of work done on a body when a force of 1 N displaces it by 1 m along the line of action of the force.

Frictional force acts in the direction opposite to the direction of displacement, so work done by friction will be negative.

Energy is the capacity or the ability of the body to do work. Its SI unit is Joule (J) and is a scalar quantity.

Forms of Energy: There are various forms of energy such as kinetic energy, potential energy, etc.

Heavy objects which are moving with a high speed possess more kinetic energy as compared to smaller objects moving with less speed.

For further practice on case study questions related to Gravitation Class 9 Science, we recommend exploring the link given below.

How to take quiz or test using the given link

It’s quite simple!

Step 1: Click on the given link. You will see the below screen.

Step 2: Fill in the necessary details. There is no need to register. Just fill your email and name and click on the button “Take Assessment”. The below screen will appear.

Step 3: Click on start assessment. Now you are ready to take test.

Frequently Asked Questions (FAQs) on Work and Energy Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 9 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 9 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our  website  to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on “Gravitation” for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on “Gravitation” class 9 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of “Force and Laws of Motion”.

Q7: When is work done by a force zero?

A7: Work done by a force is zero when the direction of force and displacement of an object are perpendicular to each other or when the displacement is zero.

Q8: A student sitting in a class does his examination paper in three hours. How much work is done by the student?

A8: No work is done by the student as there is no displacement.

Q9: What kind of energy transformations take place at a thermal power station?

A9: At a thermal power station, the chemical energy of coal is changed into heat energy which is further changed into electrical energy.

Q10: When a body is thrown upwards, its velocity becomes zero at the highest point. What will be its acceleration at this point?

A10: The acceleration at this point is equal to the value of g in the downward direction

Q11: A bullet is fired from a gun. Which will have a greater kinetic energy; the bullet or the gun?

A11: The bullet will possess greater kinetic energy.

Q12: Two identical objects, one of iron and the other of wood, are dropped from the same height on sand. Which will penetrate more and why?

A12: Iron object will penetrate more as it has more potential energy because of its greater mass.

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Case Study Questions of Chapter 2 Is Matter Around Us Pure? PDF Download

Case study Questions on Class 9 Science Chapter 2 are very important to solve for your exam. Class 9 Science Chapter 2 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 9 Science Chapter 2 Is Matter Around Us Pure?

In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Is Matter Around Us Pure? Case Study Questions With answers

Here, we have provided case-based/passage-based questions for Class 9 Science  Chapter 2 Is Matter Around Us Pure?

Case Study/Passage-Based Questions

Question 1:

Akshita wants to separate the mixture of dyes constituting a sample of ink. She marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in the figure. The filter paper was removed when the water moved near the top of the filter paper.

(i) Identify the technique used by the Akshita. (a) Sedimentation (b) Filtration (c) Chromatography (d) Distillation

Answer: (c) Chromatography.

(ii) What would you expect to see, if the ink contains three different coloured components? (a) We will not see any band on the filter paper. (b) We would see three bands on the filter paper at various lengths. (c) We would see infinite bands on the filter paper. (d) We would see the single band on the filter paper.

Answer: (b) The components of the ink will travel with water and we would see three bands on the filter paper at various lengths.

(iii) An application where you can use this technique is: (a) To separate salt from sand (b) To separate the wheat from the husk (c) To separate oil from water (d) To separate drugs from the blood.

Answer: (d) To separate drugs from blood.

(iv) The above process is used for the separation of : (a) insoluble substances (b) single solute that dissolves in the soluble solvent. (c) solutes that dissolve in the same solvent. (d) solutes that dissolve in the different solvents.

Answer: (c) For the separation of those solutes that dissolve in the same solvent.

(v) What is chromatography? (a) It is an agricultural method to separate grains (b) A method to separate magnetic impurities from non-magnetic impurities

(c) The process of separating the suspended particles of an insoluble substance (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

Answer: (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

Question 2:

A homogeneous mixture of two or more substances is called a true solution. it consists of solute and solvent. The particle size of the true solution is less than 1 nanometer. A suspension is a heterogeneous mixture in which the solute particle does not dissolve but remains suspended throughout the bulk of the medium. A colloid is a mixture that is actually heterogeneous but appears to be homogeneous as the particles are uniformly spread throughout the solution.

(i) which one of the following is most stable? 

A)True solution

B)Suspensions

D) both A and B

Answer: A)True solution

ii) which type of mixture can be separated by filtration? 

D)All of these

Answer: B)Suspensions

iii) which statement is incorrect about the Tyndall effect. *

A)True solution shows Tyndall effect

B)Suspensions show the Tyndall effect

C)Colloid show Tyndall effect

D)Both B and C show the Tyndall effect

Answer: A)True solution shows Tyndall effect

iv) Which is the correct order of stability of solution *

A) True < Colloid<Suspension

B)Colloid<Suspension<True

C)Colloid<True<Suspension

D)Suspension<Colloid<True

Answer: D)Suspension

Hope the information shed above regarding Case Study and Passage Based Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure? with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 9 Science Is Matter Around Us Pure? Case Study and Passage Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible

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Case study Questions in Class 9 Science Chapter 14 are very important to solve for your exam. Class 9 Science Chapter 14 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving  Class 9 Science Case Study Questions  Chapter 14 Natural Resources

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In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Natural Resources Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science  Chapter 14 Natural Resources

Case Study/Passage-Based Questions

Case Study 1:

Oxygen is a very abundant element on our Earth. It is found in the elemental form in the atmosphere to the extent of 21%. It also occurs extensively in the combined form in the Earth’s crust as well as also in the air in the form of carbon dioxide. In the crust, it is found as the oxides of most metals and silicon, and also as carbonate, sulfate, nitrate, and other minerals. It is also an essential component of most biological molecules like carbohydrates, proteins, nucleic acids, and fats (or lipids).

When we talk of the oxygen cycle, we are mainly referring to the cycle that maintains the levels of oxygen in the atmosphere. Oxygen from the atmosphere is used up in three processes, namely combustion, respiration, and in the formation of oxides of nitrogen. Oxygen is returned to the atmosphere in only one major process, that is, photosynthesis. And this forms the broad outline of the oxygen cycle in nature.

Though we usually think of oxygen as being necessary to live in the process of respiration, it might be of interest to you to learn that some forms of life, especially bacteria, are poisoned by elemental oxygen. In fact, even the process of nitrogen-fixing by bacteria does not take place in the presence of oxygen.

(1) How much oxygen is present in our atmosphere?

Answer: (b) 21 %

(2) Identify the correct statement

• Statement 1 – Oxygen is also an essential component of most biological molecules.
• Statement 2 – Oxygen is returned to the atmosphere through process called photosynthesis
• Statement 3 – Oxygen -cycle maintains the levels of oxygen in the atmosphere.
• Statement 4 – Our atmosphere have 21 % oxygen.

(b) Both 2 & 3

(c) Both 1 & 4

(d) All of the above

Answer: (d) All of the above

(3) Oxygen from the atmosphere is used up in three main processes,

(a) Combustion

(b) Respiration

(c) Formation of oxides of nitrogen

(4) By which process Oxygen is returned to the atmosphere

(a) Respiration

(b) Photosynthesis

(c) Photolysis

(d) None of the above

Answer: (b) or (c)

(5) Write the molecular formula of oxygen?

Answer: Molecular formula of oxygen is: O2

Case Study 2:

Natural resources are materials or substances that are obtained from the environment and are essential for sustaining life and supporting human activities. They can be classified into two main categories: renewable resources and non-renewable resources. Renewable resources are those that can be replenished or replaced naturally over time, such as sunlight, wind, water, forests, and wildlife. Non-renewable resources, on the other hand, are finite in quantity and cannot be easily replenished. Examples of non-renewable resources include fossil fuels like coal, oil, and natural gas, as well as minerals like iron, copper, and gold. It is crucial to manage and utilize natural resources sustainably to ensure their availability for future generations. Conservation and efficient utilization of resources, along with the development of alternative sources, play a significant role in maintaining a balance between human needs and the preservation of the environment.

What are natural resources? a) Materials or substances obtained from the environment b) Artificially created substances c) Human-made objects d) Renewable energy sources Answer: a) Materials or substances obtained from the environment

How are natural resources classified? a) Renewable and non-renewable resources b) Abiotic and biotic resources c) Primary and secondary resources d) Chemical and physical resources Answer: a) Renewable and non-renewable resources

Which type of resource can be replenished or replaced naturally over time? a) Renewable resources b) Non-renewable resources c) Abiotic resources d) Biotic resources Answer: a) Renewable resources

What is an example of a non-renewable resource? a) Sunlight b) Wind c) Coal d) Forests Answer: c) Coal

Why is it important to manage natural resources sustainably? a) To deplete resources for short-term gain b) To ensure their availability for future generations c) To maximize resource extraction d) To disregard environmental preservation Answer: b) To ensure their availability for future generations

Hope the information shed above regarding Case Study and Passage Based Questions for Class 9 Science Chapter 14 Natural Resources with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 9 Science Natural Resources Case Study and passage-based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible By Team Study Rate

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Case Study Based Questions: Reproduction in Animals | Science Class 8 PDF Download

Case Study 1

Do you recall the processes of digestion, circulation and respiration which you have studied in your previous classes? These processes are essential for the survival of every individual. You have also learnt about the process of reproduction in plants. Reproduction is essential for the continuation of a species. Imagine what would have happened if organisms had not reproduced. You will realise that reproduction is very important as it ensures the continuation of similar kinds of individuals, generation after generation. Modes of Reproduction: Have you seen the young ones of different animals? Try to name some of the young ones by completing shown in examples at S. No.1 and 5.You must have seen the young ones of various animals being born. Can you tell how chicks and caterpillars are born? How are kittens and puppies born? Do you think that these young ones looked the same before they were born as they do now? Let us find out. Just as in plants, there are two modes by which animals reproduce. These are: (i) Sexual reproduction, and(ii) Asexual reproduction. Sexual Reproduction Try to recall reproduction in plants which you studied in Class VII. You will remember that plants that reproduce sexually have male and female reproductive parts. Can you name these parts? In animals also, males and females have different reproductive parts or organs. Like plants, the reproductive parts in animals also produce gametes that fuse to form a zygote. It is the zygote which develops into a new individual. This type of reproduction beginning from the fusion of male and female gametes is called sexual reproduction. Let us find out the reproductive parts in humans and study the process of reproduction in them.

Q1: Reproduction is essential for the continuation of a …………………... (a) Genus (b) Species (c) Breed (d) Group Ans: (b)

Q2: Which among the following is the correct option stating the young one of a butterfly? (a) Caterpillar (b) Calf (c) Moth (d) Chick Ans: (a)

Q3: Calf is the young one of which of the following animals given below? (a) Human (b) Frog (c) Hen (d) Cow Ans: (d)

Q4: Explain in detail the term “sexual reproduction” in animals. Ans: In sexual reproduction, the reproductive parts of animals produce gametes (sperm and egg) that fuse to form a zygote. This fusion process is called fertilization. The zygote then develops into a new individual, inheriting genetic material from both parents, which leads to genetic diversity in the offspring.

Q5: Name the two modes of reproduction in animals. Ans: The two modes of reproduction in animals are: (i) Sexual reproduction (ii) Asexual reproduction

Case Study 2

Male Reproductive Organs: The male reproductive organs include a pair of testes (singular, testis), two sperm ducts and a penis. The testes produce the male gametes called sperms. Millions of sperms are produced by the testes. Though sperms are very small in size, each has a head, a middle piece and a tail. Does it appear to be a single cell? Indeed, each sperm is a single cell with all the usual cell components. Female Reproductive Organs: The female reproductive organs are a pair of ovaries, oviducts (fallopian tubes) and the uterus. The ovary produces female gametes called ova (eggs). In human beings, a single matured egg is released into the oviduct by one of the ovaries every month. Uterus is the part where development of the baby takes place. Like the sperm, an egg is also a single cell. Fertilisation: The first step in the process of reproduction is the fusion of a sperm and an ovum. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilisation. During fertilisation, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilised egg or zygote. Did you know that the zygote is the beginning of a new individual? The process of fertilisation is the meeting of an egg cell from the mother and a sperm cell from the father. So, the new individual inherits some characteristics from the mother and some from the father. Look at your brother or sister. See if you can recognise some characters in them similar to those of your mother or your father. Fertilisation which takes place inside the female body is called internal fertilisation. Internal fertilisation occurs in many animals including humans, cows, dogs and hens. Boojho and Paheli’s teacher once told them in the class that in some women oviducts are blocked. These women are unable to bear babies because sperms cannot reach the egg for fertilisation. In such cases, doctors collect freshly released egg ands perms and keep them together for a few hours for IVF or in vitro fertilisation (fertilisation outside the body). In case fertilisation occurs, the zygote is allowed to develop for about a week and then it is placed in the mother’s uterus. Complete development takes place in the uterus and the baby is born like any other baby. Babies born through this technique are called test-tube babies. This term is actually misleading because babies cannot grow in test tubes. You will be surprised to know that in many animals’ fertilisation takes place outside the body of the female. In these animals, fertilisation takes place in water. Let us find out how this happens. During spring or rainy season, frogs and toads move to ponds and slow-flowing streams. When the male and female come together in water, the female lays hundreds of eggs. Unlike hen’s egg, frog’s egg is not covered by a shell and it is comparatively very delicate. A layer of jelly holds the eggs together and provides protection to the eggs. As the eggs are laid, the male deposits sperms over them. Each sperm swims randomly in water with the help of its long tail. The sperms come in contact with the eggs. This results in fertilisation. This type of fertilisation in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilisation. It is very common in aquatic animals such as fish, starfish, etc.

Q1: Which of the following is NOT a part of the female reproductive system? (a) Fallopian tube (b) Ovaries (c) Testes (d) Uterus Ans: (c)

Q2: The type of fertilization in which the fusion of male and female gametes takes place outside the body is called ………………………... (a) Internal fertilization (b) External fertilization (c) Systemic fertilization (d) Directional fertilization Ans: (b)

Q3: Which among the following is the correct full form of IVF? (a) In voluntary fertilization (b) Inter vesicular fistula (c) Intra venous fertilization (d) In vitro fertilization Ans: (d)

Q4: Define the process of fertilization in detail. Ans: When sperm comes in contact with the egg, one of the sperm fuses with the egg to form a zygote; this process is called fertilization. The nuclei of the sperm from the male and the nuclei of the ovum from the female fuse to form a single fertilized egg or zygote.

Q5: What are test tube babies? Ans: Test tube babies are those conceived through in vitro fertilization (IVF). In this process, eggs and sperm are collected from the parents and are kept together in a laboratory setting for fertilization. Once fertilization occurs, the resulting zygote is allowed to develop for a few days and then is placed in the mother's uterus, where it can grow into a baby.

Case Study 3

How could a single cell become such a big individual? Development of Embryo: Fertilisation results in the formation of zygote which begins to develop into an embryo. The zygote divides repeatedly to give rise to a ball of cells. The cells then begin to form groups that develop into different tissues and organs of the body. This developing structure is termed an embryo. The embryo gets embedded in the wall of the uterus for further development. The embryo continues to develop in the uterus. It gradually develops body parts such as hands, legs, head, eyes, ears etc. The stage of the embryo in which all the body parts can be identified is called a foetus. When the development of the foetus is complete, the mother gives birth to the baby. Internal fertilisation takes place in hens also. But, do hens give birth to babies like human beings and cows? You know that they do not. Then, how are chicks born? Let us find out. Soon after fertilisation, the zygote divides repeatedly and travels down the oviduct. As it travels down, many protective layers are formed around it. The hard shell that you see in a hen’s egg is one such protective layer. After the hard shell is formed around the developing embryo, the hen finallylays the egg. The embryo takes about 3weeks to develop into a chick. You must have seen the hen sitting on the eggs to provide sufficient warmth. Did you know that development of the chick takes place inside the egg shell during this period? After the chick is completely developed it bursts open the egg shell. In animals which undergo external fertilisation, development of the embryo takes place outside the female body. The embryos continue to grow within their egg coverings. After the embryos develop, the eggs hatch. You must have seen numerous tadpoles swimming in ponds and streams. Viviparous and Oviparous Animals: We have learnt that some animals give birth to young ones while some animals lay eggs which later develop into young ones. The animals which give birth to young ones are called viviparous animals. Those animals which lay eggs are called oviparous animals. The following activity will help you understand better and differentiate between viviparous and oviparous animals. The eggs of a few animals are easy to observe because their mothers lay them outside their bodies. These are examples of oviparous animals. But you would not be able to collect the eggs of a dog, cow or cat. This is because they do not lay eggs. The mother gives birth to the young ones. These are examples of viviparous animals. Young Ones to Adults: The new individuals which are born or hatched from the eggs continue to grow till they become adults. In some animals, the young ones may look very different from the adults. Recall the lifecycle of the silkworm (egg → larva or caterpillar → pupa → adult) you studied in Class VII. Frog is another such example. Observe the different stages of frog starting from the egg to the adult stage. We find that there are three distinct stages, that is, egg → tadpole (larva) →adult. Don’t the tadpoles look so different from the adults? Can you imagine that these tadpoles would someday become frogs? Similarly, the caterpillar or the pupa of silkworm looks very different from the adult moth. The features that are present in the adult are not found in these young ones. Then what happens to the tadpoles or caterpillars there after? You must have seen a beautiful mothemerging out of the cocoon. In the case of tadpoles, they transform into adults capable of jumping and swimming. The transformation of the larva into an adult through drastic changes is called metamorphosis. What about the changes that we observe in our body as we grow? Do you think we too under gometamorphosis? In human beings, body parts similar to those present in the adults are present from the time of birth.

Q1: The developing zygote called the embryo gets embedded in which part of the female reproductive system? (a) Oviduct (b) Wall of uterus (c) Cervix (d) Ovary Ans: (b)

Q2: Complete the missing stage in the life cycle of silkworm: egg→ larva or caterpillar→ ……………. →Adult (a) Pupa (b) Moth (c) Tadpole (d) Nymph Ans: (a)

Q3: Which among the following is NOT an example of viviparous animals? (a) Monkey (b) Cow (c) Dog (d) Frog Ans: (d)

Q4: Define the term “metamorphosis”. Ans: Metamorphosis is the transformation of a larva into an adult through a series of drastic changes in form and structure. This process is common in insects and amphibians.

Q5: What do you mean by oviparous animals? Give one example. Ans: Oviparous animals are those that lay eggs, with the embryo developing and hatching outside the mother's body. An example of an oviparous animal is a chicken.

Case Study 4

Asexual Reproduction: So far, we have learnt about reproduction in some familiar animals. But what about very small animals like hydra and microscopic organisms like amoeba? Do you know how they reproduce? Let us find out. In each hydra, there may be one or more bulges. These bulges are the developing new individuals and they are called buds. Recall the presence of buds in yeast. In hydra too the new individuals develop as outgrowths from a single parent. This type of reproduction in which only a single parent is involved is called asexual reproduction. Since new individuals develop from the buds in hydra, this type of asexual reproduction is called budding. Another method of a sexual reproduction is observed in the microscopic organism, amoeba. Let us see how this happens. You have already learnt about the structure of amoeba. You will recall that amoeba is a single-celled organism. It begins the process of reproduction by the division of its nucleus into two nuclei. This is followed by division of its body into two, each part receiving a nucleus. Finally, two amoebae are produced from one parent amoeba. This type of asexual reproduction in which an animal reproduces by dividing into two individuals is called binary fission. Apart from budding and binary fission, there are other methods by which a single parent reproduces young ones. You will study about these in your higher classes. Story of Dolly, the Clone: Cloning is the production of an exact copy of a cell, any other living part, or a complete organism. Cloning of an animal was successfully performed for the first time by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh, Scotland. They successfully cloned a sheep named Dolly. Dolly was born on 5th July 1996 and was the first mammal to be cloned. During the process of cloning Dolly, a cell was collected from the mammary gland of a female Finn Dorsett sheep. Simultaneously, an egg was obtained from a Scottish blackface ewe. The nucleus was removed from the egg. Then, the nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed. The egg thus produced was implanted into the Scottish blackface ewe. Development of this egg followed normally and finally Dolly was born. Though Dolly was given birth by the Scottish blackface ewe, it was found to be absolutely identical to the Finn Dorsett sheep from which the nucleus was taken. Since the nucleus from the egg of the Scottish blackface ewe was removed, Dolly did not show any character of the Scottish blackface ewe. Dolly was a healthy clone of the Finn Dorsett sheep and produced several offspring of her own through normal sexual means. Unfortunately, Dolly died on 14th February 2003 due to a certain lung disease. Since Dolly, several attempts have been made to produce cloned mammals. However, many die before birth or die soon after birth. The cloned animals are many-a-times found to be born with severe abnormalities.

Q1: The process in which the bulges in the body of Hydra called the buds develop into a new individual is called ………………………………. (a) Binary fission (b) Bulbs (c) Budding (d) Budging Ans: (c)

Q2: Dolly was a healthy clone of which of the following sheep? (a) Finn Dorsett sheep (b) Scottish blackface ewe (c) Suffolk (d) Cheviot Ans: (a)

Q3: In which of the following year did Ian Wilmut successfully clone a sheep named Dolly? (a) 1996 (b) 1997 (c) 2003 (d) 1995 Ans: (a)

Q4: Define the process of “asexual reproduction”. Ans: The type of reproduction in which only a single parent is involved is known as asexual reproduction. Budding is one of the examples of asexual reproduction.

Q5: What is the process of cloning? Ans: Cloning is the process of producing an exact genetic copy of a cell, living part, or a complete organism. The first successfully cloned animal was a sheep named Dolly, who was created by Ian Wilmut in 1996.

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Case Study and Passage Based Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure?

• Last modified on: 2 years ago
• Reading Time: 4 Minutes

Case Study Questions:

Question 1:

Akshita wants to separate the mixture of dyes constituting a sample of ink. She marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in figure. The filter paper was removed when the water moved near the top of the filter paper.

(i) Identify the technique used by the Akshita. (a) Sedimentation (b) Filtration (c) Chromatography (d) Distillation

(ii) What would you expect to see, if the ink contains three different coloured components? (a) We will not see any band on the filter paper. (b) We would see three bands on the filter paper at various lengths. (c) We would see infinite bands on the filter paper. (d) We would see single band on the filter paper.

(iii) An application where you can use this technique is: (a) To separate salt from sand (b) To separate wheat from husk (c) To separate oil from water (d) To separate drugs from blood.

(iv) The above process is used for the separation of : (a) insoluble substances (b) single solute that dissolves in soluble solvent. (c) solutes that dissolve in the same solvent. (d) solutes that dissolve in the different solvents.

(v) What is chromatography ? (a) It is an agricultural method to separate grains (b) A method to separate magnetic impurities from non-magnetic impurities (c) The process of separating the suspended particles of an insoluble substance (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

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