Question 1

Why is the concentration of ozone less over the north and south poles?

Accepted Answer

Correct answer is C

Question 2

Which of the following strategy is not a correct approach to reduce global warming?

Accepted Answer

Correct answer is D

Question 3

A gas produced by paddy fields and concerned with global warming is:

Accepted Answer

Correct answer is D

Question 4

Steps taken by the Government of India to control air pollution include:

Accepted Answer

Correct answer is D

Question 5

BOD refers to:

Accepted Answer

Correct answer is B

Question 6

Biochemical Oxygen Demand (BOD) in a river water:

Accepted Answer

The degree of pollution is directly proportional to BOD , therefore more the organic pollution (Specially sewage), the more would be BOD of water.

Question 7

Global agreement in specific control strategies to reduce the release of ozone depleting substances was adopted by:

Accepted Answer

Correct answer is B

Question 8

DDT residues are rapidly passed through food chain causing biomagnification because DDT is:

Accepted Answer

Correct answer is A

Question 9

Which of the following would most likely help to slow down the greenhouse effect?

Accepted Answer

Correct answer is C

Question 10

World Summit on sustainable Development (2002) was held in?

Accepted Answer

Correct answer is B

Question 11

A lake near a village suffered heavy mortally of fishes within a few days. Consider the following reasons for this.(A) Lots of urea and phosphate fertilizer were used in the crops in the vicinity(B) The area was sprayed with DDT by an aircraft(C) The lake water tumed green and stinky(D) Phytoplankton populations in the lake declined intially thereby greatly reducing photosynthesisWhich two of the above were the main causes of fish mortality in the lake?

Accepted Answer

Correct answer is A

Question 12

For clean environment, which one of the following is not essential?

Accepted Answer

Correct answer is D

Question 13

Which of the following is not properly matched?

Accepted Answer

Correct answer is D

Question 14

Gaseous pollutants can be controlled by:

Accepted Answer

Correct answer is D

Question 15

It is estimated that out of the total global warming the relative contribution of CO2​,CH4​,CFC5​ and N2​O are found respectively as:

Accepted Answer

Correct answer is A

Question 16

The amount of freshwater of the earth frozen as polar or glaclal ice is:

Accepted Answer

Correct answer is D

Question 17

Maximum noise permissible during day time in residential areas:

Accepted Answer

In a residential areas during day time 55 Db of sound is permissible.

Question 18

Most harmful environmental pollutants are:

Accepted Answer

Correct answer is C

Question 19

Protective layer of ozone in the atmosphere exists in which laver?

Accepted Answer

Good ozone is found in the upper part of the atmosphere called the stratosphere and it acts as a shield absorbing UV rays from the sun.

Question 20

Green house effect means:

Accepted Answer

Correct answer is D

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Solution for Class 12, Biology, Environmental Issues

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