Ncert Exercises & Solutions

Phosphate-containing fertilizers cause water pollution. The addition of such compounds in water bodies causes-

a.	Enhanced growth of algae
b.	Decrease in the amount of dissolved oxygen in the water
c.	Deposition of calcium phosphate
d.	Increases fish population

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Hint: Enhance the growth of algae reduces the oxygen concentration in water

Fertilizers contain phosphates as additives. The addition of phosphates in water enhances algae growth. Such profuse growth of algae covers the water surface and reduces the oxygen concentration in water.

This leads to the anaerobic condition, commonly with the accumulation of obnoxious decay and animal death. Thus, bloom-infested water inhibits the growth of other living organisms in the water body.

This process in which nutrient-enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity is known as eutrophication.

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