Question

Biological magnification of pesticides takes place through the following:

• A. Population pyramids
• B. Hydrological cycle
• C. Food chains
• D. Air cycle

Hint:

Higher trophic level organisms always accumulate maximum pesticide concentration due to biomagnification.

Answer 1

The Correct Option is C

Step 1: Understanding biological magnification.
Biological magnification refers to the increase in concentration of toxic substances, such as pesticides, at successive trophic levels of an ecosystem.
Step 2: Movement of pesticides in ecosystems.
Pesticides enter producers first and then pass to herbivores and carnivores through feeding relationships, increasing in concentration at each level.
Step 3: Analyzing the options.
(A) Incorrect, population pyramids show population structure, not toxin transfer.
(B) Incorrect, hydrological cycle involves water movement only.
(C) Correct, food chains transfer pesticides across trophic levels.
(D) Incorrect, air cycle does not cause magnification in organisms.
Step 4: Conclusion.
Biological magnification of pesticides occurs through food chains.