Prelims MCQs Quiz 9 : Environment


1. With reference to forest ecosystems, consider the following statements :
1. The number pyramid is neither inverted nor upward.
2. The biomass pyramid is inverted.
Which of the statements given above is/are correct ?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer & Explanation

2. Which of the following is a part of the biogeochemical cycle ?
1. soils
2. plants
3. atmosphere
4. oceans
Select the correct answer using the codes given below.
a) 1, 2 and 3 only
b) 1 ,3 and 4 only
c) 2 ,3 and 4 only
d) 1 ,2, 3 and 4

Answer & Explanation

3. In ecological terms, what does the term “standing crop” signify ?
a) total weight of whole organic matter
b) total weight of heterotrops
c) total area covered by crops
d) None of the above

Answer & Explanation

4. Which among these would increase carbon dioxide in the atmosphere ?
1. deforestation
2. burning of firewood
3. automobiles
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2 and 3

Answer & Explanation

5. The energy flow in an ecosystem is :
1. unidirectional
2. non-cyclic
3. cyclic
4. bidirectional
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 4 only
d) 3 and 4 only

Answer & Explanation

6. Ozone depletion would impact the plant community in several ways. These include :
1. increase in photosynthesis
2. decline in water use efficiency
3. decline in yield of plants
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2 and 3

Answer & Explanation

7. Which among these is/are a cryogenic indicator of climate change ?
1. ice sheets and ice chores
2. sea level changes
3. lacustrine deposists
Select the correct answer using the codes given below.
a) 1 only
b) 1 and 2 only
c) 2 and 3 only
d) 1, 2 and 3

Answer & Explanation

8. The National Air Quality Monitoring Programme (NAMP) run by Central Pollution Control Board, monitors which of the following pollutants at all locations ?
1. carbon dioxide
2. sulphur dioxide
3. oxides of nitrogen
4. suspended particulate matter
Select the correct answer using the codes given below.
a) 1, 2 and 3 only
b) 1 ,3 and 4 only
c) 2 ,3 and 4 only
d) 1 ,2, and 4 only

Answer & Explanation

9. The ecological processes follow the principle of uniformitarianism. This means :
a) the ecological processes have a uniform effect
b) same physical and biological processes that operates today operated in the past.
c) physical and biological processes operate with a uniform rate
d) None of the above

Answer & Explanation

10. Which among the following are mechanical method of soil conservation ?
1. bunding
2. terracing
3. contour farming
4. stubble mulching
Select the correct answer using the codes given below.
a) 1, 2 and 3 only
b) 1 ,3 and 4 only
c) 2 ,3 and 4 only
d) 1 ,2, and 4 only

Answer & Explanation

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Please read these important articles about prelims preparation

1. How UPSC asks current affairs in GS Prelims

2. How to practice prelims MCQs for UPSC

3. Applying logic in UPSC General Studies Prelims

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