Class 10 Science

Chapter 13 Solutions — Our Environment

Open Solutions PDF →Also seeTextbook page→

Open Solutions PDFReads in your browser→Also seeTextbook page→

Solutions

Overview

Step-by-step NCERT solutions for Our Environment (Chapter 13, CBSE Class 10 Science) — the full working for every question, not just the final answer. You can also read the Our Environment textbook chapter.

Solved

What these solutions cover

All 16 questions in Our Environment are solved in the PDF. Here's what's inside, exercise by exercise:

Eco-system and Its Components

Why are some substances biodegradable and some non-biodegradable?
Give any two ways in which biodegradable substances would affect the environment.
Give any two ways in which non-biodegradable substances would affect the environment.

Food Chains and the Flow of Energy

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What is the role of decomposers in the ecosystem?

Ozone Layer and Garbage Management

What is ozone and how does it affect any ecosystem?
How can you help in reducing the problem of waste disposal? Give any two methods.

End-of-Chapter Exercise

1.
Which of the following groups contain only biodegradable items?
- (a) Grass, flowers and leather
- (b) Grass, wood and plastic
- (c) Fruit-peels, cake and lime-juice
- (d) Cake, wood and grass
2.
Which of the following constitute a food-chain?
- (a) Grass, wheat and mango
- (b) Grass, goat and human
- (c) Goat, cow and elephant
- (d) Grass, fish and goat
3.
Which of the following are environment-friendly practices?
- (a) Carrying cloth-bags to put purchases in while shopping
- (b) Switching off unnecessary lights and fans
- (c) Walking to school instead of getting your mother to drop you on her scooter
- (d) All of the above
What will happen if we kill all the organisms in one trophic level?
Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
What are the problems caused by the non-biodegradable wastes that we generate?
If all the waste we generate is biodegradable, will this have no impact on the environment?
Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

Keep solving