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Q.

Which causes water pollution?

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a

Pathogens

b

Automobile exhausts

c

PCBs

d

(1) and (3)

answer is D.

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Detailed Solution

Pathogens include bacteria and other organisms that enter water from domestic sewage and animal excreta. PCBs (Polychlorinated biphenyls) are used as a fluids in transformers and capacitators. The presence of these PCBs in water causes skin disorder in human. These act as carcinogenic.

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