First slide

Water Pollution and its Control

Question

Mark the incorrect statement with regard to algal blooms.

Easy

A

Algal bloom imparts a distinct colour to the water bodies.
B

Algal bloom causes deterioration of the water quality and fish mortality.
C

Some bloom-forming algae are extremely toxic to human beings and animals.
D

Algal blooms lead to increase in DO and decrease in BOD.

Solution

Presence of large amounts of nutrients in waters also causes excessive growth of planktonic (free-floating) algae, called an algal bloom. Micro-organisms involved in biodegradation of these organic nutrients consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen (DO) and increase in Biochemical Oxygen Demand (BOD).

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