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Important Class 10 Science MCQ Questions of Our Environment with Answers?

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Class 10 Science MCQ Questions of Our Environment with Answer have been set up according to the most recent syllabus, and examination pattern.

These MCQ Questions will help you acquaint with important concepts and topics to be prepared for the objective type questions to be asked in the Class 10 Science CBSE Exam. Multiple Choice Questions practiced appropriately can assist you with getting better grades.

Practice Class 10 Science MCQ Questions of Our Environment

1. The formula of Ozone is _______

(a) \(O_3\)
(b) \(O_2\)
(c) \(O_4\)
(d) \(O_6\)

2. _______ is an omnivore animal.

(a) Lion
(b) Hawk
(c) Jackal
(d) Man

3. _____ is not a biodegradable pollutant.

(a) Paper
(b) Cotton cloth
(c) Cotton
(d) DDT

4. We should reduce the use of the plastic bags, bottles etc. because:

(a) They are not durable
(b) They are non-biodegradable
(c) They are made of toxic materials
(d) They react with the atmospheric gases

5. Which among the following statements is incorrect in view of the plants?

(a) They convert the solar energy into mechanical energy
(b) They prepare their food from organic compounds
(c) They are also called producers
(d) They are the initial source of energy in a food chain

6. In natural ecosystems, decomposers include-

(a) only bacteria and fungi
(b) only microscopic animals
(c) herbivores and carnivores
(d) both (b) and (c)

7. The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about-

(a) 1%
(b) 8%
(c) 5%
(d) 10%

8. Which of the following is not a terrestrial ecosystem-

(a) forest
(b) desert
(c) aquarium
(d) grassland

9. In the garden ecosystem, which of the following are producers?

(a) Insects
(b) Snakes
(c) Grasses
(d) Rabbits

10. Which of the following is an autotroph?

(a) Lion
(b) Insect
(c) Tree
(d) Mushroom

11. Ozone layer is damaged by-

(a) methane
(b) carbon-dioxide
(c) Sulphur-dioxide
(d) CFCs

12. Acid rain is caused due to _______.

(a) Carbon oxides
(b) Nitrogen oxides
(c) Sulphur oxides
(d) both b and c

13. Edaphic factors include ______.

(a) Abiotic components
(b) Biotic components
(c) Producers
(d) Consumers

14. In a food chain the second trophic level is occupied by:

(a) Carnivores
(b) Autotrophs
(c) Herbivores
(d) Producers

15. Which among the following is a correct full form for DDT?

(a) Dichloro-diphenyl-trichloroethane
(b) Dichloro-diphenyl-tetrachloroethane
(c) Dichloro-decaphenyl-trichloroethane
(d) Dichloro-diethyl-trichloroethane

16. Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?

(a) Gamma radiations
(b) Cosmic radiations
(c) Infrared radiations
(d) Ultraviolet radiations

17. Global warming is a phenomenon related to:

(a) Evaporation
(b) Ecological balance
(c) Greenhouse effect
(d) Desertification

18. Which of the two sets belong to the same trophic level?

(a) Rabbit : Tiger
(b) Vulture : Rat
(c) Grasshopper : Hawk
(d) Frog : Lizard

19. An ecosystem includes

(a) all living organisms
(b) non-living objects
(c) both living organisms and non-living objects
(d) sometimes living organisms and sometimes non-living objects

20. In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of

(a) heat energy
(b) light energy
(c) chemical energy
(d) mechanical energy

Answer key


1. (a) \(O_3\)
2. (d) Man
3.  (d) DDT
4.  (b) They are non-biodegradable

Explanation: Plastics bags and bottles come under the category of non-biodegradable products because they cannot be broken down by natural process and tend to damage the safety of the environment.
5. (b) They prepare their food from organic compounds

Explanation: Plants prepare food from sunlight and inorganic constituents like carbon dioxide and water.

6. (a) only bacteria and fungi
7. (a) 1%
8. (c) aquarium
9. (c) Grasses
10. (c) Tree
11. (d) CFCs
12. (d) both b and c
13. (a) Abiotic components
14. (c) Herbivores

Explanation: Herbivores occupy the second trophic level after autotrophs or producers.

15. (a) Dichloro-diphenyl-trichloroethane

Explanation: The full form of DDT is Dichloro-diphenyl-trichloroethane. It is known for its insecticidal properties.
16. (d) Ultraviolet radiations

Explanation: UV radiation is a highly damaging radiation, which when enters the environment can change atmospheric nitrogen into ozone.
17. (c) Greenhouse effect

Explanation: The increase in greenhouse gases in the environment leads to global warming.
18. (d) Frog : Lizard
19.  (c) both living organisms and non-living objects
20. (c) chemical energy

Click here to practice more MCQ Questions from Chapter Our Environment Class 10 Science

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