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NCERT · Class 10 · Science

Chapter 13: Our Environment

Practice each question, then open the answer or worked solution.

Textbook exercises

16 questions
Q11Written answer

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

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Worked solution

Ans: If we kill all the organisms in one trophic level, the transfer of energy to the next level will stop.

It'll lead to overpopulation at one level. This would disturb the food chain and cause the collapse of the ecosystem.


Q12Written answer

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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Worked solution

Ans: Yes, the impact of removing all the organisms at a trophic level will be different for different trophic levels. For example, on removing producers; herbivores would not be able to survive or they would migrate and the ecosystem would collapse. If herbivores are removed, producers would grow unchecked and carnivores would not get food. If carnivores are removed, herbivores would increase to unsustainable levels and could destroy the producers. If decomposers are removed, the dead animals would pile up due to which the environment would become polluted. In addition to this, if dead animals will not decompose, the recycling of nutrients in the soil will be stopped and its fertility will be reduced. As a result, the green cover of the earth will be lost. Thus to maintain the balance of the ecosystem the presence of organisms is necessary at each trophic level.


Q13Written answer

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

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Worked solution

Ans: Biological magnification is that the increase in the concentration of harmful chemical substances like pesticides within the body of living organisms at every biological process level of an organic phenomenon is named biological magnification. Yes, levels of biomagnification would increase because the biological process level would increase and would be the very best for the uppermost biological process level. it might have an effect on their organic process like growth, replica, etc.


Q14Written answer

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

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Ans: Following are the problems caused by the non-biodegradable wastes that we generate: 

  • They do not disintegrate and get accumulated within the setting.

  • Harmful non-biodegradable chemicals enter the organic phenomenon and cause biological magnification.

  • They cause air, land, water and soil pollution.

  • If not treated, the native population of animals, birds, plants and humans is severely suffering from intense non-biodegradable wastes there in space.


Q15Written answer

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

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Worked solution

Ans: If the quantity of perishable waste will increase, then this excess perishable waste will certainly have an impression on the surroundings. The surplus perishable waste is rotten by the action of decomposers then it releases harmful greenhouse gases. These gases can accumulate within the atmosphere, inflicting warming. Perishable waste is recycled simply by the decomposers like bacteria and fungi. It'll have solely this dangerous impact on our surroundings that several Of the gases discharged throughout the decomposition method might end in global warming.


Q16Written answer

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

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Worked solution

Ans: The ozone layer is the protective layer of the earth from harmful rays. It plays a significant role in protecting all living and nonliving organisms. If a layer is broken no organism will survive. Following measures, the steps being taken to limit this harm. 

  • We must always minimize the employment of vehicles.

  • We must always not encourage the burning of fossil fuels.

  • It's currently necessary for all the producing firms to form CFC- free refrigerators throughout the globe.