Algal bloom is due to and results in:

(1) Presence of large amount of nutrients in water

(2) Excessive growth of free floating or planktonic algae

(3) Distinct color to the water bodies

(4) All of these

Subtopic:  Water Pollution: I | Water Pollution |
 89%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which of the following statements is wrong?

(1) Algal bloom cause deterioration of the water quality and fish mortality

(2) Some bloom forming algae are extremely toxic to human beings and animals

(3) Sewage discharge causes mortality of fish and other aquatic creatures

(4) Beautiful orange colored flowers have caused havoc in India because of their faster growth

Subtopic:  Water Pollution: I | Water Pollution |
 81%
From NCERT
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Water hyacinth

Find the odd one out

(1) Eichhornia crassipes

(2) Introduced in India for their lovely flowers

(3) Have mauve colored flowers

(4) Does not has any characteristic shape

Subtopic:  Water Pollution: I | Water Pollution |
 83%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which of the following option is wrong about Water hyacinth?

(1) World's most problematic weed

(2) Terror of Bengal

(3) Grow abundantly in eutrophic water bodies

(4) Maintains a balance in the ecosystem dynamics of the water body

Subtopic:  Water Pollution: I | Water Pollution |
 94%
From NCERT
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Sewage has heavy metals

(1) Elements with density greater than 5g /cm3

(2) Elements with density greater than 10g /cm3

(3) Elements with density greater than 15g /cm3

(4) Substances with density greater than 0.3g/cm3

Subtopic:  Water Pollution: I | Water Pollution |
 78%
From NCERT
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Biomagnification is a well known phenomenon for

(1) Mercury

(2) DDT

(3) Silver

(4) Both A and B

Subtopic:  Water Pollution: I | Water Pollution |
 82%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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Concentration of DDT in water is 0.003 ppb, what can be the most commonly seen concentration of DDT in zooplankton?

(1) 4 ppb

(2) 5 ppm

(3) 0.04 ppm

(4) 2 ppm

Subtopic:  Water Pollution: I | Water Pollution |
 82%
From NCERT
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Biomagnification of DDT in a fish eating bird can reach to

(1) 20 ppm

(2) 20 ppb

(3) 25 ppb

(4) 25 ppm

Subtopic:  Water Pollution: I | Water Pollution |
 73%
From NCERT
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Why does biological magnification happen?

(1) The toxic substances can be digested but are not metabolised by our body

(2) The toxic substances can neither by digested nor be metabolised and just pass on to the next generation

(3) The toxic substances causes genetic mutation that pass to next generation

(4) Both B and C

Subtopic:  Water Pollution: I | Water Pollution |
 56%
From NCERT
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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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NEET 2023 - Target Batch - Aryan Raj Singh
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