Question 3

Sewage also contains some nutrients and bacteria. Comment.

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Solution

Sewage is a complex mixture that contains suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease-causing bacteria and other microbes.

The nutrients present in sewage are phosphorus and nitrogen.

The bacteria present in sewage include those bacteria which cause water-borne diseases such as cholera and typhoid.

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Sewage contains harmful nutrients such as phosphorus and ________.

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Question 22

A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give names for (x), (a) and (b)?

Q. Select the correct option.

Assertion: Water pollution tends to cause cholera, typhoid, and jaundice.
Reason: Sewage may contain bacteria, viruses, fungi and parasites.

Question 15

Animal waste, oil and urea are some of the organic impurities present in sewage. Name two more organic impurities present in sewage.

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Question 3 Sewage also contains some nutrients and bacteria. Comment.

Question 3

Sewage also contains some nutrients and bacteria. Comment.