High concentration of DDT directly disturbs

(1) Calcium Metabolism in birds

(2) Thinning of eggshell

(3) Premature breaking of eggshell

(4) Decline in bird population

Subtopic:  Water Pollution: I | Water Pollution |
 73%
From NCERT
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The natural aging of a lake by nutrient enrichment of its water is called

(1) Biomagnification

(2) Eutrophication

(3) Biopiracy

(4) Biosystematics

Subtopic:  Water Pollution: I | Water Pollution |
 94%
From NCERT
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when lake is young, the water is

(1) Cold and clear

(2) Warm and turbid

(3) Cold and turbid

(4) Warm and clear

Subtopic:  Water Pollution: I | Water Pollution |
 86%
From NCERT
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Streams draining into the lake and introduce nutrients such as ………

(Young lake)

(1) Nitrogen and Phosphorus

(2) DDT and cadmium

(3) DDT

(4) Calcium

Subtopic:  Water Pollution: I | Water Pollution |
 84%
From NCERT
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The animals which live in warm areas will prefer

(1) A young lake

(2) An old lake

(3) Lake with no nutrients

(4) Cannot be predicted

Subtopic:  Water Pollution: I | Water Pollution |
 76%
From NCERT
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Large masses of floating Plants-Bog

Are found in

(1) A young lake

(2) An old lake

(3) Nutrients are less

(4) Cannot be predicted

Subtopic:  Water Pollution: I | Water Pollution |
 82%
From NCERT
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The natural ageing of lake

(1) Depends on climate

(2) Depends on size of lake

(3) May take thousands of years

(4) All of these

Subtopic:  Water Pollution: I | Water Pollution |
 91%
From NCERT
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The pollutants from man's activities can radically accelerate the ageing process of a lake known as

(1) Cultural Eutrophication

(2) Accelerated Eutrophication

(3) Biomagnification

(4) Both A and B

Subtopic:  Water Pollution: I | Water Pollution |
 71%
From NCERT
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Which of the following is harmful for aquatic organisms?

(1) Thermal wastewaters

(2) Agricultural waste

(3) Industrial waste

(4) All of these

Subtopic:  Water Pollution: I | Water Pollution |
 92%
From NCERT
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The prime contaminants of sewage water which act as plant nutrient are

(1) Nitrates and Phosphates

(2) Phosphates

(3) Nitrates, DDT

(4) Cadmium and DDT

Subtopic:  Water Pollution: I | Water Pollution |
 92%
From NCERT
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