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Class XII Biology Environmental Issues 2

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Question 1

Foul smell in the water bodies of tanks, ponds, etc., is due to

Question 2

Frequent occurrence of water blooms in a lake indicates

Question 3

Tubifex in water indicates its

Question 4

Water pollution is caused by

Question 5

Biological Oxygen Demand (BOD) is a measure of

Question 6

Assertion: Agriculture output increased several times after introduction of DDT
Reason : DDT was the first insecticide used on a wide scale.

Question 7

Phosphate pollution is caused by

Question 8

Assertion: Nuclear energy can be produced only by the fusion of certain elements.
Reason: Renewable resources can become limiting.

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Jul 5NEET & AIIMS