Question

Which of the following statements is related to biological magnification?

• A. There is a progressive increase in biological activities through trophic levels.
• B. There is a progressive increase in the level of harmful substances through trophic levels.
• C. There is a progressive increase in the body weight through trophic levels.
• D. There is a progressive increase in the number of organisms through trophic levels.

Answer 1

The correct option is B There is a progressive increase in the level of harmful substances through trophic levels.

The toxic substances which cannot be metabolized get accumulated at a particular trophic level. This leads to an increase in the concentration of the toxicant at successive trophic levels. This phenomenon is called biological magnification and is well-known for mercury and DDT. The higher the trophic level of an organism in the food chain greater will be the magnification of toxic chemicals.

So, the correct answer is option B.