Question

Increase in the concentration of pollutants in higher trophic levels is called [BHU 2001]
A) Recycling
B) Eutrophication
C) Biodegradation
D) Biomagnification

Answer 1

The correct answer of this question is option B, Eutrophication.

When the natural water body is became excessively enriched with nutrients and minerals ,the upper surface of that water body becomes filled with a thick layer of algae or plant.

This phenomenon is known as the eutrophication.

And, that's why the correct answer of this question is option B.

Answer 2

Increase in the ‘concentration of pollutants’ in higher trophic levels is called is called D) bio-magnification.  

Explanation:

Bio magnification is a type of magnification that occurs in organisms of higher trophic levels in an ecosystem.

A pollutant which affects the primitive organism. In an ecosystem or a low trophic level organism in an ecosystem gets accumulated in the body of the animal and gets magnified once it reaches the higher organisms.