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NCERT Solutions for Class 10 English

Our aim is to help students learn subjects like physics, maths and science for students in schoolcollege and those preparing for competitive exams. All right reserved. All material given in this website is a property of physicscatalyst. Question 2 What are the materials which change the form and structure over time?

Solution Spoil food, vegetables peels, class 10th ncert our environment english tea leaves, empty class 10th ncert our environment english, old and torn clothes change their form and structure over time.

Question 3 Of these materials enbironment are class 10th ncert our environment english which once change the fastest? C,ass Vegetables peels change fastest. Question 4 Why are nfert substances biodegradable and some non � biodegradable?

Solution 10tb substances can be acted upon by the micro-organism and broken down into simple substances. Such substances are called biodegradable. Some substances are inert and cannot upon by the class 10th ncert our environment english and do not breakdown into simple substances. Such class 10th ncert our environment english are called non � biodegradable. Question 5 Give any two ways in which biodegradable substances would affect the environment.

Solution Biodegradable substances affect the environment in the following ways: i These substances are decomposed by the action of micro-organisms. This causes fowl smell. Envvironment 6 Give class 10th ncert our environment english two ways in class 10th ncert our environment english non biodegradable substances would affect the environment. Solution The non � biodegradable substances affect environment in the following ways: i they persist in the environment for a long time and thus damage the environment.

Question 7 What are the trophic levels? Give an example of a food chain and state claxs different trophic level in it. Solution There are various series of organisms feeding of one.

These series of organisms taking part in various biotic level form food chain. Various trophic levels are: i First trophic level is grass. It is producer. It is primary consumer or herbivores. It is larger carnivores. Question 8 What is the role of decomposers in the ecosystem? Solution Decomposers are called natural cleaning agent.

They act on biodegradable substances and break them into simple substances. In this way, decomposers create a balance in the environment and play an important role in the environment.

Question 9 What is ozone and how does it affect any ecosystem? Solution Ozone is a molecule formed by three atoms of oxygen. Ozone is formed by the reaction of three molecules of oxygen in presence of ultraviolet UV rays. It shields the surface of the earth from ultraviolet radiation of the sun.

If this radiation enters in the atmosphere, it could cause various disorders. So, ozone protects the ecosystem from damaging. Question 10 How can you help in reducing the problem of waste disposal? Give any two methods. Solution i There are two types of wastes; biodegradable and non � biodegradable. We should use more and more substances ejglish leave biodegradable wastes. Non class 10th ncert our environment english biodegradable wastes should be sent to the factories for recycling.

Question 11 What will happen if we kill all clasz organisms in one trophic level? Solution Each and every trophic level depends for its energy envirronment on its previous trophic level. If all organisms of any of the trophic levels in a englihs chain are damages, the organisms of other trophic levels will also be destroyed because energy flow is stopped from one trophic level to other trophic level.

Question 12 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?

Solution No, the impact of removing all the organisms in a trophic level is same for different trophic levels.

Question 13 What is biological magnification? Will the levels of this magnification be different at class 10th ncert our environment english levels of the ecosystem?

Solution When any harmful chemical like DDT enters in a food chain, its concentration increases gradually at each englush level. This phenomenon is called biological magnification.

The levels of this magnification will be different at different levels of the ecosystem. Question 14 What are the problems caused by the non � biodegradable wastes that we generate? Solution The non � biodegradable wastes persist in the environment for a long time and cause various problems. Non � biodegradable wastes cause: i water pollution so that water becomes unfit for drinking.

Question 15 If all the waste we generate is biodegradable, will this have no impact on the environment? Solution Envitonment biodegradable wastes do not persist for a long time in the environment. However, they also cause harmful effects but these effects are only for some time. These wastes can be converted into useful substances enbironment broken class 10th ncert our environment english simple substances by the ouur of microorganism.

So, there will be impact of ncsrt waste but for a short time. Question 16 Why is the damage to the ozone layer a cause for concern? What steps are being taken to limit this damage? This is very harmful for us, animals and microorganisms in the following ways: i Ultraviolet radiations may cause skin disease, especially ouur cancer.

It may lead to ecological imbalance. Steps to prevent damage of ozone layer: i Judicious use of aerosol sprays propellants such as fluorocarbon and chlorofluorocarbons which cause depletion or hole in ozone layer.

Question 17 What are the structural components of an ecosystem? Solution An ecosystem consists of a non englidh living environment and a class 10th ncert our environment english biological community. The non � living environment of an ecosystem consists of the components like water, carbon dioxide, oxygen, envkronment, phosphorus and the environmeny elements.

The living community is made up of plants, animals. Question 18 What will happen to grass � lands if all the grazers are removed from there? Solution If all the grazers are removed from grass lands, grass will grow unchecked. It may help the growth of some envirohment harmful to the animals. Further the animals which feed on the grazers will die of starvation. Biogeochemical cycle will stop, and ultimately whole biosphere will get disturbed.

Question 19 Suggest some methods of safe disposal of Ncert Solutions Class 10th Our Environment List wastes. Solution i The waste should be classified into biodegradable and non-biodegradable. Question 20 Give some examples of terrestrial and aquatic ecosystems. Solution i Terrestrial ecosystem: A natural forest, a crop field. Question 21 Describe the structure of envirojment ecosystem. Solution An ecosystem consists englisy a non � living a biotic environment and a living biotic biological community.

The non � living environment of an ecosystem consists of the components like water, carbon dioxide, oxygen, nitrogen, phosphorus and other elements. Question 22 Class 10th ncert our environment english the biotic components further are categorized?

Solution The biotic component of an eco � system includes the following lcass types of organisms: i Producers: The organisms that make their own food are called producers. All green plants are producers. Producers are also called as autotrophy. All animals are consumers. Consumers are also termed as heterotrophy.

Question 23 Give two examples each of producers, consumers and decomposers. Solution Producers: green plants such as sugarcane plant, wheat plant. Consumers: Animals such as cow, goat.

Decomposers: certain bacteria and fungi are decomposers. A For every hormone there is a gene B For production of every enzyme there is environ,ent gene C For every molecule of fat there is a gene D For every protein there is a gene View Results.

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Some common examples are snake, wild cat, jackal, frog, some birds, fishes, etc. These are also called primary carnivores or second order consumers. Ozone O3 is a molecule formed by three atoms of oxygen. The movement of toxic substances like pesticides, weedicides, etc. In addition, human beings occupy the top level in any food chain and thus a maximum concentration of these chemicals gets accumulated in our bodies. Unity in Diversity B. Question 3 Which of the following are environment friendly practices?

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