Question

Eutrophication means

(a) thermal change in water

(b) filling up of water body with aquatic due to extra nourishment

(c) solid waste

(d) none of the above​

Answer 1

Answer:

excessive richness of nutrients in a lake or other body of water, frequently due to run-off from the land, which causes a dense growth of plant life.

Answer 2

Eutrophication means filling up of water body with aquatic due to extra nourishment.  Option (b) is correct.

Explanation:

Eutrophication:

Polluted water enhances the growth of algae and water hyacinth, which reduces the supply of oxygen and sunlight to the aquatic fauna and flora, adversely affecting their development. This is called eutrophication.

The excess fertilizers used by farmers are washed away by rain and carried to the nearby water bodies. The presence of fertilizers in these water bodies is a boon for algae growing over there. Because these fertilizers increase the nutrient levels in the water, thus, algae flourish and reproduce rapidly. The growing algae use up most of the dissolved oxygen in the water.

As a result, the other aquatic animals deprive of oxygen as they breathe in the dissolved oxygen. This would lead to their death.

This phenomenon of becoming an aquatic ecosystem enriched with nutrients for plant life is called eutrophication.

Hence, Option (b) filling up of water body with aquatic due to extra nourishment is correct, and Option (a) thermal change in water,(c) solid waste, and (d) none of the above​ is incorrect.

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