Prelims MCQs Quiz 22 : Environment


1. With reference to ecosystem stability, consider the following statements:
1. A diverse and complex ecosystem is more stable.
2. Ecosystem stability increases with decrease in number of links in food web.
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. The brown haze dome formed in cities is because of which gas?
a) sulphur dioxide.
b) nitrogen oxide.
c) carbon dioxide.
d) volatile organic compounds (VOCs).

Answer & Explanation

3. Which of the following is/are part of the biosphere?
1. water
2. soil
3. plants
Select the correct answer using the codes given below.
a) 1 and 2 only
b) 1 and 3 only
c) 3 only
d) 1, 2 and 3

Answer & Explanation

4. When acid rain falls on buildings made of marble, what is the final product that flakes off easily?
a) calcium carbonate
b) gypsum
c) dolomite
d) epsom

Answer & Explanation

5. The development of vegetation community in any ecosystem is affected by:
1. sunlight
2. soil texture
3. relief
4. human
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

6. Consider the following statements:
1. The area recorded as forests in the government records is called forest cover.
2. A forest cover may or may not be a part of forest area.
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

7. Ecotone is best defined as:
a) the most extensive ecosystem unit which is convenient to designate.
b) the vegetation community developed at the last stage of biotic succession.
c) transition area between two biomes.
d) None of the above.

Answer & Explanation

8. Persistent organic pollutants (PoPs) are harmful for health and environment because:
1. they are resistant to environmental degradation.
2. they can undergo bioaccumulation.
3. they can cause global warming.
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

9. Water in a wetland can be:
1. Fresh
2. Brackish
3. Static
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

10. Which of the following is responsible for maximum GHGs emission?
a) Industrial processes
b) Agriculture
c) Thermal power stations
d) Transportation fuels

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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