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15. Our Environment-Text-book Questions Science Class 10 In English
Last Updated : 06 March 2026
Explore science Solutions for Class 10 Chapter 15. Our Environment Topic Text-book Questions in English medium.
15. Our Environment-Text-book Questions Science Class 10 In English
Last Updated : 06 March 2026
15. Our Environment-Text-book Questions Science Class 10 In English
15. Our Environment
Text-book Questions
Text-book Questions
Page no. 257
Q1. Why are some substances biodegradable and some non-biodegradable?
Ans: Non-biodegradable substances are those which are decomposed by small organisms into simpler substances in a biological process. In contrast, non-biodegradable substances remain for a long time. They do not know how to decompose and they are harmful.
Q2. Give any two ways in which biodegradable substances would affect the environment.
Ans: (i) The decomposition of organic matter makes the atmosphere smelly.
(ii) Some toxic gases are produced during their decomposition such as - CO2, it pollutes the environment.
Q3. Give any two ways in which non-biodegradable substances would affect the environment.
Ans: (i) Non-biodegradable substances remain in the environment for a long time due to not being decomposed, hence polluting the environment.
(ii) They are spreading dirt on the earth. These are also affecting the sewerage system. Example - plastic bags.
Page no. 261
Q1. What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Ans: The chain of organisms participating at various biological levels forms the food chain.
Each of its stages forms a trophic level.
Grass - worm - frog - snake - vulture
(a) Grass is the first trophic level of the food chain. It prepares its own food.
(b) The worm is the second trophic level of the food chain.
(c) Frog is the third trophic level and it eats grass.
(d) Snake is the fourth host of this chain.
(e) Vulture is the fifth and end host level of this chain.
Q2. What is the role of decomposers in the ecosystem?
Ans: Micro-organisms like bacteria and fungi etc. scavenge the residue. These organisms convert complex organic substances into simple inorganic substances. These substances are absorbed by the soil, so these micro-organisms help in recycling and protect the environment from dirt.
Page no. 264
Q1. What is ozone and how does it affect any ecosystem?
Ans: Three atoms of oxygen combine to form one molecule of ozone O3. The ozone layer is in the upper surface of the atmosphere, it absorbs the harmful ultraviolet radiations of the sun. Therefore, ozone protects us from many diseases like skin cancer, ulcers etc.
Q2. How can you help in reducing the problem of waste disposal? Give any two methods.
Ans: (i) We should use organic matter instead of inorganic material. We should use paper or jute bags instead of plastic bags.
(ii) Organic waste should be disposed of in a place where it can be ready for recycling.
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NCERT Solutions for Class 10 science Chapter 15. Our Environment Topic Text-book Questions
NCERT Solutions for Class 10 science Chapter 15. Our Environment Topic Text-book Questions are prepared to help students understand important concepts of the chapter in a simple and clear manner. These solutions are based on the latest CBSE syllabus and follow the official NCERT textbooks. Students who are searching for accurate answers and step-by-step explanations can use these solutions to improve their learning and prepare better for school exams as well as board examinations.
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About Chapter 15. Our Environment of Class 10 science
Chapter 15. Our Environment is an important part of the Class 10 science syllabus. This chapter explains several key concepts which are essential for understanding the subject in detail. Students often face difficulties while solving textbook questions related to this chapter. That is why NCERT Solutions for Chapter 15. Our Environment are provided to explain every concept in a simple and structured way.
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Understanding Topic: Text-book Questions
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Conclusion
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15. Our Environment-Text-book Questions Science Class 10 In English
Hindi Medium Students/Teachers/Tutors:
All Chapters science Class 10
Class Wise NCERT Solutions
Students can find NCERT Solutions for Class 6, Class 7, Class 8, Class 9, Class 10, Class 11, and Class 12 on this page. Each class includes detailed solutions for important subjects such as Science, Mathematics, Social Science, English, and Hindi. These solutions are carefully prepared to ensure accuracy and clarity.
- NCERT Solutions for Classes 6 to 8 – Ideal for building strong basic concepts.
- NCERT Solutions for Classes 9 and 10 – Helpful for board exam preparation.
- NCERT Solutions for Classes 11 and 12 – Important for advanced concepts and competitive exams.
15. Our Environment-Text-book Questions Science Class 10 In English Study Materials For Class 6 to 12
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