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?
(a) 20 %
(b) 21 %
(c) 22 %
(d) 23 %
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.
(a) Only 1
(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
(d) All of the above
Answer: (d) All of the above
(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
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