Question

5.
Name the kind of 'growths' in water that lead to a depletion of the oxygen
dissolved in it.​

Answer 1

Answer:

Decomposer bacteria

Explanation:

When fertilizer enters the water they promote the growth of algae. The algae cover the whole surface of water and block the sunlight. So the plants die because they can no longer photosynthesize. Soon the algae also die. This provides food to the decomposer bacteria which feed on them and use up all the oxygen leading to oxygen depletion.

Answer 2

Answer:

when the water body becomes enriched in dissolved nutrients

Explanation:

expecially phospores and nitrogen,they stimulate the growth of aquatic plant life ,which can lead to the depletion of dissolved oxygen .This is knoum as eutrophication