First slide

Water Pollution and its Control

Question

Algal blooms in aquatic bodies cause all of the following, except

Moderate

A

Distinct colour
B

Deterioration of water quality
C

Biomagnification
D

Increased BOD

Solution

Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level.
Algal blooms impart a distinct colour to the water bodies. They cause deterioration of the water quality and fish mortality and the decomposing remains increase the BOD.

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