NCERT Solutions Class10 Science Chapter 15

Here you will find NCERT Solutions Class10 Science Chapter 15 which is an important chapter that contains all the main and important topics and has a complete and detailed description. NCERT Solutions Class10 Science Chapter 15 will help the students of class 10 to understand concepts. For better practice, you can also solve the Extra questions of chapter 15.

NCERT Solutions Class10 Science Chapter 15 is totally based on the CBSE syllabus 2021-22, which is important for the upcoming board examinations.

NCERT Solutions for Class10 Science Chapter 15 Our Environment

NCERT Solutions for Class10 Science Chapter15 Our Environment covers the following topics and subtopics.

1. What Happens When We Add Our Waste to The Environment?

2. Eco- System – What Are Its Components

3. How Do Our Activities Affect the Environment?

Class 10 science chapter our environment ncert solutions will be very useful for all Students of the CBSE Board, RBSE, and other state boards.

You can also watch videos of Solutions of Chapter 15 Our Environment of NCERT Science for Class 10 online. The solution is based on the latest syllabus of CBSE 2021-22.

Our Environment NCERT Solutions Science for Class 10 Intext questions

Chapter 15 -Our Environment

Questions (Page 257)

Q.1 Why are some substances biodegradable and some are non-biodegradable?

Ans. a). Biodegradable substances:- The substances which can be broken down into non-poisonous and simple substances by the action of microorganisms or biological processes in nature are called biodegradable substances such cattle dung, vegetable stuff, tea leaves, paper wood, leather, etc.

b). Non-biodegradable substances:- the substances which cannot be broken down to non-poisonous and simpler substances by the action of microorganism or biological processes in nature, are called non-biodegradable substances such as pesticides, plastics, polythene bags, glass, metals, etc.

Q.2 Give any two ways in which biodegradable substances would affect the environment.

Ans. Biodegradable substances are decomposed into simple substances by biological processes. These substances would affect the environment in the following manner-

i.Poisonous and foul-smelling gases like methane are formed and these are responsible for the greenhouse effect

ii. Dead and decaying substances make water unsafe and cause water pollution.

Q.3 Give any two ways in which non-biodegradable substances would affect the environment.

Ans.

i.Non – biodegradable substances in the form of fine particles pollute water, air, and soil.

ii. They increase biomagnification in the food chain and end up human beings.

Questions (Page 262)

Q.1 What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

Ans. Trophic levels- ‘Trophic ’ means organisms. In a food chain, there are many levels in which energy (food) flows in one direction. These levels are called trophic levels.

chapter 15 Our Environment - Food chain

In the above food chain grass is first trophic level, deer second level, and the lion is third trophic level.

Q.2 What is the role of decomposers in the ecosystem?

Ans.

i. Decomposers act as scavengers or cleaning agents in the environment.

ii. They release nutrients back to the environment by decomposing the dead remains of plants and animals.

Questions (Page 264)

Q.1 What is ozone and how does it affect any ecosystem?

Ans. Ozone (O3) is a molecule formed by three atoms of oxygen. Ozone forms a layer at a certain height of the atmosphere. It protects living beings from the harmful ultraviolet rays emitted by the sun.

Q.2 How can you help in reducing the problem of waste disposal? Give any two methods.

Ans. We can help in reducing the problem of waste disposal in the following ways:

(i) Biodegradable waste should be used to obtain biogas and manure.

(ii)The wastes from industries should be treated at the plant site before disposal.

Class 10Science Chapter 15 Exercise Solution

Q.1 Which of the following groups contains only biodegradable items?

(a) grass, flowers, and leather

(b) grass, wood, and plastic

(d) cake, wood, and grass

Ans. Groups containing biodegradable items only (a), (c), and (d).

Q.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

Ans. (b)grass, goat and human

Q.3 Which of the following are environment-friendly practices?

(a)carrying cloth bags to put a purchase in while shopping

(b) switching off unnecessary lights and fans

(d) all the above

Ans. (d)all the above

Q.4 What will happen if we kill all the organisms at one trophic level?

Ans. If we kill all the organisms at one trophic level, there will be the following effects.

(i) The population of organisms in the previous trophic level will increase.

(ii) It will cause an ecological imbalance.

(iii)The organisms in the next trophic level will not be able to get the food, so they will migrate to some other ecosystem or die.

Q.5 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?

Ans. Yes, the impact of removing all the organisms at a trophic level will be different for different trophic levels. For example, if all carnivores are killed then initially the population of herbivores would increase. They will eat all vegetation therefore an imbalance in an ecosystem will occur later or sooner.

No, it is not possible that the organisms of any trophic level can be removed without causing any damage to the ecosystem. All producers and consumers form a food web and any harm to this web will affect all living beings.

Q.6 What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Ans. Continuous progress is harmful non-biodegradable substances in progressive trophic levels of the food chain is called biological magnification.

Yes, the levels of magnification will be different at different levels of the ecosystem.

Q.7 What are the problems caused by the non-biodegradable wastes that we generate?

Ans. Non-biodegradable wastes cause the following problems –

i.Very large space is required for disposal.

ii. Many harmful substances like DDT, CFC, etc are released that enter the food chain.

iii.Its volume cannot be reduced.

Q.8 If all the waste we generate is biodegradable, will this have no impact on the environment?

Ans. If all the waste we generate is biodegradable, it will cause no pollution, but still, it is not true to say that there will be no impact on the environment because excess of any waste is not good for the environment. Decomposition of these substances produces a foul smell and forms a breeding place for germs and pests.

Q.9 Why is damage to the ozone layer a cause of concern? What steps are being taken to limit this damage?

Ans. The ozone layer prevents the harmful ultraviolet radiation from the sun to enter the atmosphere and reaching the earth's surface. Exposure to ultraviolet radiation may cause fatal disease skin cancer and change in genetic-material DNA, increase in the average temperature of the earth. That’s why damage to the ozone layer is a cause of great concern.

The United Nations Environment Programme (UNEP) succeeded in forging an agreement to freeze CFC production at the 1986 level.

Important points of Our Environment NCER solutions

1.The various components of an ecosystem are interdependent.

2The products make the energy from sunlight available to the rest of the ecosystem.

3There is a loss of energy as we go from one trophic level to the next, this limits the number of trophic levels in a food chain.

4 Human activities have an impact on the environment.

5.The use of chemicals like CFCs has endangered the Ozone layer. Since the Ozone layer protects against the ultraviolet radiation from the sun. this could damage the environment.

6. The waste we generate may be biodegradable or non-biodegradable.

7.The disposal of the waste we generate is causing serious environmental problems.

True /false of NCERT Solutions for Class 10 Science Chapter 15

1. Ozone layer prevents harmful infra-red radiation. [ ]

2. Modern packaging has increased our waste. [ ]

3. Cow dung is the best used in a biogas plant. [ ]

4. Plastics are biodegradable substances. [ ]

5. Exposures to ultraviolet radiation may cause lung cancer. [ ]

6.Light, temperature, humidity, and pressure are non-living components.[ ]

7. Kulhads are better than disposal cups.[ ]

8. Functional units that have live and non-living components are called biome.[ ]

9. Grass is an example of a consumer.[ ]

10. Bacteria and fungi are decomposers.[ ]

11. Lion is herbivorous.[ ]

12. All animals including man are autotrophs.[ ]

13. Herbivorous are individuals are producers.[ ]

14. A sequence of living beings showing “who eats whom’ is called a food chain.[ ]

15. If the trophic levels are increased in a food chain more energy will reach the top carnivores.[ ]

16. Near about 5% of the total sun’s energy reaching on earth is used by plants.[ ]

17. Overhunting resulted in making most of Rajasthan a desert.[ ]

18. Decrease in predator population will decrease the prey- population. [ ]

19. Man’s activities are responsible for pollution.[ ]

20. The pigment that traps solar energy is called haemoglobin.[ ]

21. Energy available at each successive level is 15% of the previous level.[ ]

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Friday, January 14, 2022

NCERT Solutions Class10 Science Chapter 15