Which of the following are bio pollutants?

Spores and pollen grains

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Algae

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Protonzoans

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Dairy and poultry waste

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Solution

The correct option is B Algae
Excessive amounts of nitrates and phosphates from agricultural run-off cause a type of biopollution called eutrophication that stimulates an explosive growth of algae that depletes the water of oxygen. When the algae die are eaten by bacteria. Hence pond waters become hypoxic (oxygen poor) or anoxic (completely depleted of oxygen) due to algal blooms. Thus the correct answer is option B.

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