CBSE Class 12 Ecosystem Multiple Choice Questions with Answers. MCQ Questions Class 12 Ecosystem with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT MCQ questions Class 12 Ecosystem with Answers to know their preparation level.
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MCQ Questions Class 12 Ecosystem with Answers - Set - 2
Question 1:
Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considered as Occupying
(a) First trophic level
(b) Second trophic level
(c) Third trophic level
(d) Fourth trophic level
Correct Answer – (B)
Question 2:
CO2 content of atmosphere is about
(a) 6.5%
(b) 3.334%
(c) 0.34%
(d) 0.034%
Correct Answer – (D)
Question 3:
Which important greenhouse gas, other than methane is being produced from the agricultural fields?
(a) Arsine
(b) Sulphur dioxide
(c) Ammonia
(d) Nitrous oxide
Correct Answer – (D)
Question 4:
If there was no CO2 in the earth’s atmosphere, the temperature of the earth’s surface would be
(a) Same as the present
(b) Less than the present
(c) Higher than the present
(d) Depends on the amount of O2 in the atmosphere
Correct Answer – (B)
Question 5:
Concentration of nitrogen remains constant by
(b) Nitrogen cycle
(b) Thundering and lightning
(c) Enzymes
(d) Both (a) and (b)
Correct Answer – (D)
MCQ Questions Class 12 Ecosystem With Answers
Question 6:
Ultraviolet radiation from sunlight causes a reaction which produces
(a) O3
(b) SO2
(c) CO
(d) CH4
Correct Answer – (A)
Question 7:
Zone of atmosphere near the ground is
(a) Troposphere
(b) Stratosphere
(c) Homosphere
(d) All of these
Correct Answer – (A)
Question 8:
Bacterial role in carbon cycle is
(a) Chemosynthesis
(b) Photosynthesis
(c) Breakdown of organic matter
(d) Assimilation of nitrogen compounds
Correct Answer – (C)
Question 9:
In the phosphorus cycle, phosphate becomes available by weathering of rocks first to
(a) Consumers
(b) Producers
(c) Decomposers
(d) None of these
Correct Answer – (B)
Question 10:
Maximum productivity is found in
(a) Grassland
(b) Desert
(c) Ocean
(d) Tropical rain forest
Correct Answer – (C)
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