Most important MCQs from the chapter – Nutrient cycles MCQs for UPSC, State PSC and Other Examinations.
1. Solar radiation plays the most important role in which among the following ?
(a) Carbon cycle
(b) Oxygen cycle
(c) Water cycle
(d) Nitrogen cycle
Correct Answer –Â (c) Water cycle
2. Carbon is present in the atmosphere, mainly in the form of ?
(a) Carbon dioxide
(b) Carbon monoxide
(c) Water
(d) Black Carbon
Correct Answer –Â (a) Carbon dioxide
3. Which of the following does not add carbon dioxide to the atmosphere ?
(a) Respiration
(b) Decay of organic matter
(c) Photosynthesis
(d) Volcanic eruptions
Correct Answer –Â (c) Photosynthesis
4. Consider the following statements about Nitrogen:
1. Nitrogen is the most abundant gas in the Earth’s atmosphere.
2. Atmospheric Nitrogen can be used directly by most living organisms.
Select the correct statement(s) using the codes given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Correct Answer – (a) 1 only
5. Consider the following statements about Nitrogen Fixation:
1. Certain microorganisms are capable of fixing atmospheric nitrogen into usable form which can be used by plants.
2. Rhizobium is a nitrogen-fixing bacteria.
Select the correct statement(s) using the codes given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Correct Answer – (c) Both 1 and 2
6. Which of the following bacteria is able to convert the Nitrogen from Nitrite to Nitrate ?
(a) Azotobacter
(b) Rhizobium
(c) Nitrobacter
(d) Plasmodium
Correct Answer –Â (c) Nitrobacter
7. Which of the following bacteria forms a symbiotic nitrogen-fixing association with roots of legumes ?
(a) Azotobacter
(b) Rhizobium
(c) Nitrobacter
(d) Plasmodium
Correct Answer –Â (b) RhizobiumÂ
8. Consider the following statements about Denitrification:
1. In denitrification, nitrates/nitrites are converted into elemental nitrogen.
2. Pseudomonas is a denitrifying bacteria.
Select the correct statement(s) using the codes given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Correct Answer – (c) Both 1 and 2
9. Consider the following statements about Phosphorus:
1. Phosphorus is usually found in the form of phosphates.
2. It is a common ingredient in fertilizers.
Select the correct statement(s) using the codes given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Correct Answer – (c) Both 1 and 2
10. Which among the following processes add sulfur to the atmosphere ?
(a) In the process of decomposition
(b) Volcanic eruptions
(c) Combustion of fossil fuels
(d) All of the above
Correct Answer –Â (d) All of the above
11. Consider the following statements about Acid Rain:
1. It contains Sulfuric acid (H2SO4).
2. It is good for aquatic life in the oceans.
Select the correct statement(s) using the codes given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Correct Answer – (a) 1 only
12. In the Nitrogen Cycle, soil nitrates are transformed back into free nitrogen by which among the following ?
(a) Nitrifying bacteria
(b) Denitrifying bacteria
(c) Ammonifying bacteria
(d) None of the Above
Correct Answer – (b) Denitrifying bacteria
13. Which among the following is the driving force of all the ecosystems on the earth ?
(a) Solar energy
(b) Producer
(c) Carbon
(d) Biomass
Correct Answer – (a) Solar energyÂ
14. Consider the following statements:
1. Ecological productivity decreases from the equator towards the poles.
2. Insolation increases from the equator towards the poles.
Select the correct statement(s) using the codes given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Correct Answer – (a) 1 only
15. Consider the following statements about carbon sink:
1. A carbon sink is a carbon pool that has the capability to take more carbon from the atmosphere than it releases.
2. Forests and Soils are examples of carbon sinks.
Select the correct statement(s) using the codes given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Correct Answer – (c) Both 1 and 2
Most important MCQs from the chapter – Basics of Ecology MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – Ecological succession and Forests MCQs.
Most important MCQs from the chapter – Ecosystems and Biomes MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – Environmental Conventions and Protocols MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – Environmental Pollution and Climate Change MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – Endangered Species of India MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – Biodiversity Conservation MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – Environment Protection Initiatives in India MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – Environmental Organizations in India MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – National Parks and Tiger Reserves in India MCQs for UPSC, State PSC and Other Examinations.
Most important MCQs from the chapter – Environment Related Days of the Year MCQs for UPSC, State PSC and Other Examinations.
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