What are the different ways in which water gets polluted? How does it affect the life forms?

Q. What are the different ways in which water gets polluted? How does it affect the life forms?
Ans. (a) The addition of undesirable substances like fertilizers and pesticides, poisonous substances mercury salts in water. These could also be disease – causing organisms, like the bacteria which cause cholera.
(b) The removable of desired substances like oxygen from the water adversely affect the aquatic organisms.
(c) A sudden change in temperature in water bodies would be dangerous and affect their breeding. The eggs and larvae are affected by the change in temperature.

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