NCERT Solutions for Class 10 Science Unit 15

Our Environment Class 10

Unit 15 Our Environment Exercise Solutions

Environment : Our surrounding is called environment.

Ecosystem : This is a system of interdependencies among various living beings and non-living things in a given habitat.

Components of Ecosystem : An ecosystem has two types of components, viz. biotic component and abiotic component.
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Question : Solutions of Questions on Page Number : 257

Q1 :  

Why are some substances biodegradable and some non-biodegradable?


Answer :

Some substances such as metal, glass, plastic, etc. which cannot be decomposed by the living organisms are non-biodegradable wastes. These substances are non-biodegradable because the micro-organisms do not have enzymes that can digest these substances. Therefore, we classify them as non-biodegradable wastes. Other substances such as paper, vegetable wastes, etc. that can be easily broken down by enzymes are biodegradable wastes.

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Q2 :  

Give any two ways in which biodegradable substances would affect the environment.


Answer :

Biodegradable substances affect the environment in the following ways:

(i) The biodegradable substances such as tree leaves, plant parts, and kitchen wastes can be used as humus after composting. This will enhance the soil fertility.

(ii) The biodegradable substances mainly contain carbon. These substances after decomposition release that carbon back into the atmosphere.

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Q3 :  

Give any two ways in which non-biodegradable substances would affect the environment.


Answer :

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Q4 :  

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


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Q5 :  

What is the role of decomposers in the ecosystem?


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Questionexercise : Solutions of Questions on Page Number : 264

Q1 :  

What is ozone and how does it affect any ecosystem?


Answer :

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Q2 :  

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


Answer :

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Q3 :  

How can you help in reducing the problem of waste disposal? Give any two methods.


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Q4 :  

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


Answer :

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Q5 :  

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


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Exercise : Solutions of Questions on Page Number : 265

Q1 :  

What will happen if we kill all the organisms in one trophic level?


Answer :

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Q2 :  

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?


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Q3 :  

What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?


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Q4 :  

What are the problems caused by the non-biodegradable wastes that we generate?


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Q5 :  

If all the waste we generate is biodegradable, will this have no impact on the environment?


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Q6 :  

Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?


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Science : CBSE NCERT Exercise Solutions for Class 10th for Our Environment will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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