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Excessive accumulation of organic matter...

Excessive accumulation of organic matter in water bodies leads of :

A

Decrease in species diversity

B

Increase in species diversity

C

Green house effect

D

No effect on species diversity

Text Solution

Verified by Experts

The correct Answer is:
A
Organic matter (organic wastes) contains a number of pathogen, secondary pollutant, pesticides etc. Biological oxygen demand becomes high, and therefore the dissolved oxygen reduced. Hence, planktons Mollusca and fishes will be eliminated due to reduced dissolved oxygen and presence of secondary pollutants. Some species like annelid worm Tubifex and some insect larvae (Chironomus) tolerate pollution.
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