Q. 6 C

Answer the follow

Answer :

The following constitutes the major reasons for water pollution:

1. Aquatic weeds- Aquatic weeds causes depletion in oxygen level of the river water. It thus changes the natural qualities of water.

2. Decomposing matter- Decomposing plants and animal bodies also adds matter to water.

3. Mud/sludge- River current and its diversion add mud/sludge in the water making it polluted.

4. Soil erosion- Soil erosion contributes to the addition of biotic and abiotic factors into the water bodies.

5. Microbes- Microbes like bacteria grows in the matter decaying in the water which pollutes it

6. Algae- Excessive algal growth effects the biological oxygen demand

7. Nematodes- Nematodes are added with water

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