Sewage contains harmful nutrients such as phosphorus and ________.

nitrogen

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carbon

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oxygen

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sulphur

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Solution

The correct option is A
nitrogen

Sewage contains harmful nutrients such as phosphorus and nitrogen.
Too much nitrogen and phosphorus in water causes algae to grow faster. Significant increase in algae will lead to decrease in oxygen which is required by other aquatic animals.
Hence, excess of nutrients in sewage is harmful.

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Similar questions

List two major harmful effects of each of the following :

(i) Rivers contaminated with sewage.

(ii) Too much gaseous exhausts containing $C O_{2} a n d S O_{2}$ .

(iii) Pesticides such as DDT used in agriculture.

(iv) Prolonged noise such as the one produced by crackers

Assertion (A): Much of the nitrogen and small amounts of phosphorus and sulphur are carried in the organic form through xylem.

Reason (R): Xylem transports only inorganic nutrients and phloem transports only organic nutrients.

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