Question

Biomagnification is a well-known phenomenon abundantly occur with

• A. Heavy metals
• B. Hydrogen sulphide
• C. Methane
• D. Ammonia

Hint:

Remember: Bioaccumulation is in one individual over time; Biomagnification is up the food chain. Heavy metals like mercury are the primary reason for "fish consumption advisories" in polluted areas.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks to identify the category of substances that typically undergo biomagnification in an aquatic food web.

Step 2: Detailed Explanation:

• Biomagnification: This is the process where the concentration of a persistent, non-biodegradable substance increases as it moves up through successive trophic levels in a food chain. For a substance to biomagnify, it must be:
- Persistent (doesn't break down easily).
- Fat-soluble (bioaccumulates in tissues).
- Mobile in the environment.

• Heavy Metals: Elements like Mercury (especially Methylmercury), Lead, Cadmium, and Arsenic are classic examples. They are taken up by plankton in small amounts, but top predators like large tuna, sharks, or humans eat thousands of these smaller organisms, leading to dangerously high concentrations in their bodies.

• Analysis of other options: Hydrogen sulphide, Methane, and Ammonia are simple molecules or gases. While they can be toxic in high concentrations, they are either metabolized, excreted, or released into the atmosphere and do not accumulate or magnify through the food chain.

Step 3: Final Answer:
Biomagnification abundantly occurs with heavy metals (and persistent organic pollutants like DDT).