Class 10 Science MCQ Chapter 15 Our Environment, Class 10 Science MCQ Question Answer, Class 10 Science Multiple Choice Question Answer to each chapter is provided in the list of SCERT Science Class 10 Objective Types Question Answer so that you can easily browse through different chapters and select needs one. Class 10 Science MCQ Chapter 15 Our Environment Question Answer can be of great value to excel in the examination.
SCERT Class 10 Science MCQ Chapter 15 Our Environment
SCERT Class 10 General Science MCQ Chapter 15 Our Environment Notes covers all the exercise questions in SCERT Science Textbooks. The NCERT Class 10 Science MCQ Chapter 15 Our Environment provided here ensures a smooth and easy understanding of all the concepts. Understand the concepts behind every chapter and score well in the board exams.
Our Environment
Chapter – 15
Multiple Choice Questions & Answers
1. Which of the following is non-biodegradable?
(a) Wood.
(b) Paper.
(c) Cotton clothes.
(d) Plastics.
Ans: (d) Plastics.
2. Which of the following is an artificial ecosystem?
(a) Garden.
(b) Pond.
(c) Forest.
(d) Lake.
Ans: (a) Garden.
3. Which of the following organism can be called producer?
(a) Bacteria.
(b) Fungi.
(c) Blue-green algae.
(d) Herbivores.
Ans: (c) Blue-green algae.
4. Which of the following organism plays the role of a decomposer?
(a) Blue-green algae.
(b) Bacteria.
(c) Green plants.
(d) Parasites.
Ans: (b) Bacteria.
5. To which of the following trophic labels do autotrophs or producers belong-
(a) 1st.
(b) 2nd.
(c) 3rd.
(d) 4th.
Ans: (a) 1st.
6. To which of the following trophic labels do herbivores or primary consumers belong-
(a) 1st.
(b) 2nd.
(c) 3rd.
(d) 4th.
Ans: (a) 2nd.
7. To which of the following trophic levels do small carnivores or secondary consumers belong-
(a) 1st.
(b) 2nd.
(c) 3rd.
(d) 4th.
Ans: (c) 3rd
8. The animals which belong to the fourth trophic level –
(a) Autotrophs.
(b) Small carnivores.
(c) Large carni vores.
(d) Herbivores.
Ans: (c) large carni vores.
9. What percent of Sun’s light energy is trapped by the green plants to convert into food energy?
(a) 10%
(b) 1%
(c) 90%
(d) 100%
Ans: (b)1%
10. The average amount of organic matter that reaches the next level of consumer from the previous level-
(a) 1%
(b) 20%
(c) 40%
(d) 10%
Ans: (d)10%
11. Which of the following organisms has the maximum number in an ecosystem?
(a) Producers.
(b) Primary consumer or herbivores.
(c) Secondary consumer or small carnivores.
(d) Tertiary consumer or large carnivores.
Ans: (a) Producers.
12. Which of the following substances is responsible for the depletion of ozone layer?
(a) Oxygen.
(b) Ultraviolet rays.
(c) Chlorofluorocarbon.
(d) Helium.
Ans: (c) Chlorofluorocarbon.
13. 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.
Ans: (a), (c), (d)
14. 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.
15. 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.
Ans: (d) All of the above.
16. The substances which are broken down by biological processes are said to be-
(a) Renewable.
(b) Non-renewable.
(c) Biodegradable.
(d) Non-biodegradable.
Ans: (c) bBiodegradable.
17. The substances which are not broken down by biological processes are said to be-
(a) Renewable.
(b) Non-renewable.
(c) Biodegradable.
(d) Non-biodegradable.
Ans: (d) Non-biodegradable.
18. Which one of the following is not a biodegradable waste?
(a) Vegetable wastes of Kitchen.
(b) Old torn clothes.
(c) Polythene bag.
(d) Old newspaper.
Ans: (c) Polythene bag.
19. Which one of the following is a biodegradable waste?
(a) Polythene bags.
(b) Mango peels.
(c) Aluminium foil.
(d) Glass.
Ans: (b) Mango peels.
20. Which one of the following is a non-biodegradable waste?
(a) Used Tea leaves.
(b) Torn leather bag.
(c) Empty medicine bottle.
(d) Empty cardboard cartons.
Ans: (c) Empty medicine bottle.
21. The non-biodegradable substances are not broken down to simpler form, because-
(a) They are very hard.
(b) They are not acted upon by physical processes like heat and pressure.
(c) They are not broken down by the action of bacteria and other saprophytes.
(d) None of the above.
Ans: (c) They are not broken down by the action of bacteria and other saprophytes.
22. By which of the following processes are biodegradable substances broken down?
(a) Physical.
(b) Chemical.
(c) Biological.
(d) Thermal.
Ans: (c) Biological.
23. Which of the following wastes is biodegradable?
(i) Torn leather shoes.
(ii) Milk packets.
(iii) Spoilt food.
(iv) Old glass bottles.
The correct answer is-
(a) (i), (iii)
(b) only (iii)
(c) (i),(ii), (iii)
(d) (i), (ii)
Ans: (a) (i), (iii)
24. All the interacting organ- isms in an area together with the non-living components form-
(a) An environment.
(b) Biotic community.
(c) A biosphere.
(d) An ecosystem.
Ans: (d) An ecosystem.
25. Which one of the following is a decomposer?
(i) Bacteria.
(ii) Algae.
(iii) Protozoa.
(iv) Fungi.
The correct option is-
(a) (i), (ii)
(b) (i)
(c) (i), (iv)
(d) (i), (iii)
Ans: (c)(i), (iv)
26. The organisms found in the first trophic level of a food chain-
(a) Primary consumers.
(b) Herbivores.
(c) Consumers.
(d) Producers.
Ans: (d) Producers.
27. Organisms found in the second trophic level of a food chain-
(a) Secondary consumers.
(b) Producers.
(c) Primary consumer.
(d) Tertiary consumers.
Ans: (c) Primary consumer.
28. Organisms found in the third trophic level of a food chain-
(a) Secondary consumers.
(b) Tertiary consumers.
(c) Decomposers.
(d) Producer.
Ans: (a) Secondary consumers.
29. Energy for a food chain is provided by-
(a) Autotrophs.
(b) Herbivores.
(c) The sun.
(d) Decomposers
Ans: (c) The sun.
30. The interlinking of various food chains in an ecosystem gives rise to.
(a) Energy flow diagram.
(b) Food web.
(c) Biological magnification.
(d) Trophic level.
Ans: (b) Food web.
31. In which organism of the following food chain, the level of biological magnification would be the highest?
Grass → Grasshopper → Frog → Snake → Eagle
(a) Eagle.
(b) Snake.
(c) Grass.
(d) Frog.
Ans: (a) Eagle.
32. Which organism of the following food chain acquires maximum energy?
Grass → Deer →Tiger
(a) Tiger.
(b) Deer.
(c) Grass.
(d) All three acquire equal amounts of energy.
Ans: (c) Grass.
33. Ozone abstracts – at higher level of the atmosphere –
(a) Infra-red radiations.
(b) Visible light.
(c) UV radiations.
(d) Both (a) and (b)
Ans: (c) UV radiations.
Very Short & Short Type Questions Answers
1. What are biodegradable substances? Give example.
Ans: Substances that are broken down by biological processes are said to be biodegradable substances.
Example: Paper, cloth, vegetable waste etc.
2. What are non-biodegradable substances? Give examples.
Ans: Substances which are not broken-down by biological processes are called non-biodegradable substances.
Example: plastic, rubber, glass etc.
3. What do you mean by the term ‘ecosystem’?
Ans: All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem.
4. What are the two components of an ecosystem.
Ans: There are two components of an ecosystem. They are-
(i) Biotic component and
(ii) Abiotic component.
5. Give examples of two natural ecosystems.
Ans: (i) Forests.
(ii) ponds.
6. Give examples of two artificial ecosystems.
Ans: Garden and crop field.
7. What are the three major groups in which the biotic components of an ecosystem are divided?
Ans: (i) Producers.
(ii) consumers. and
(iii) decomposers.
8. What are producers?
Ans: The organisms which can make organic compounds like sugar and starch from inorganic substances using the energy from the Sun in presence of chlorophyll, are called producers.
9. Give example of two producers.
Ans: All green plants and certain blue-green algae.
10. What are consumers?
Ans: The organisms which consume the food produced, either directly from producers or indirectly by feeding on other consumers are called consumers.
11. How are consumers further classified?
Ans: Herbivores, carnivores, omnivores and parasites.
12. What are decomposers?
Ans: The microorganisms which break down the complex organic substances present in dead remains and waste products of organisms into simple inorganic substances are called decomposers.
13. Give two examples of decomposers?
Ans: Bacteria and Fungi.
14. What is a food chain?
Ans: A series of organisms feeding on one another form a food chain.
15. What is a food web?
Ans: Each organism in nature is generally eaten by two or more other kinds of organisms which in turn are eaten by several other organisms. So, instead of a straight-line food chain, the relationship between various organisms can be shown as a series of branching lines, called a food web.
16. What do you mean by biological magnification?
Ans: Some harmful chemicals always enter our food chain and as human beings occupy the top level in any food chain, the maximum concentration of these chemicals get accumulated in our bodies. This phenomenon is known as biological magnification.
17. Why are some substances biodegradable and some non-biodegradable?
Ans: Some substances get broken down by biological processes and hence they are biodegradable. On the other hand, some substances do get broken down by biological processes, and hence they are non-biode-gradable.
18. Give any one way in which biodegradable substances would affect the environment.
Ans: As biodegradable substances are broken-down by biological processes, they don’t persist in our environment for a long time and hence do not contribute to any type of pollution.
19. Give any one way in which non-biodegradable substances would affect the environment.
Ans: As non-biodegradable substances do not get broken down by biological processes, they persist in our surrounding for a very long time and contribute to different types of pollution of the environment.
20. What are trophic levels?
Ans: Each step or level in a food chain is called a trophic level.
21. Give an example of a food chain and state the different trophic levels in it.
Ans: Example of a food chain:
Grass → Grasshopper → frog → snake
First trophic level → grass (producer) Second trophic
Level → Grasshopper (Primary consumer)
Third trophic level → Frog (Secondary consumer)
Fourth trophic level → Snake (tertiary consumer)
22. What is the role of decomposers in the ecosystem?
Ans: The decomposers help in natural replenishment of the soil by returning the simple inorganic substances to the soil by the break-down of complex organic substances.
23. What is ozone?
Ans: Ozone is a molecule formed by three atoms of oxygen.
24. How does ozone affect any ecosystem?
Ans Ozone absorbs harmful ultraviolet radiation from the sun. This radiation is highly damaging to all organisms.
25. How can you help in reducing the problem of waste disposal? Give any one method.
Ans: We can reduce the use of non-biodegradable materials in our day-to-day life. We should use as many bio-degradable materials as possible.
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