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Q.

Select the correct option for the statements (I) and (II)(I) When a lot of organic matter is thrown into water the total oxygen is dissolved in water is consumed.(II) When DO is zero anaerobic bacteria break down the organic matter to produce foul smelling chemicals harmful to human being.

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a

Both (I) and (II) are correct

b

(I) is correct but (II) is incorrect

c

(II) is correct but (I) is incorrect

d

Both (I) and (II) are incorrect

answer is A.

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Detailed Solution

When a lot of organic matter is thrown into water the total oxygen is dissolved in water is consumed. When DO is zero anaerobic bacteria break down the organic matter to produce foul smelling chemicals harmful to human being.

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Select the correct option for the statements (I) and (II)(I) When a lot of organic matter is thrown into water the total oxygen is dissolved in water is consumed.(II) When DO is zero anaerobic bacteria break down the organic matter to produce foul smelling chemicals harmful to human being.