Question

Biological magnification' is the phenomenon of

• A. Biodegradation of sewage waste
• B. Increase in concentration of sewage in water
• C. Increase in biological activity of micro-organisms
• D. Increase in concentration of pesticides at successive trophic levels

Answer 1

The correct option is D

Increase in concentration of pesticides at successive trophic levels

The correct option is D.

Explanation of the correct option :

1. Non-biodegradable chemicals get accumulated progressively at each trophic level.
2. This phenomenon is known as biological magnification.
3. Generally, maximum accumulation of these chemicals is found at the top of the food chain or the last trophic level.

Explanation of the incorrect option:

Option A:

Biodegradation is a process by which organic micro-pollutant get removed during waste water management.

Option B:

Increase in concentration of sewage in water causes water pollution and transmits water borne diseases.

Option C:

Increase in biological activity of micro-organisms results organic matter decomposition, humus formation, nitrogen cycling etc.

Final answer: Biological magnification' is the phenomenon of increase in concentration of pesticides at successive trophic levels.