Correct answer is B . Humans use fertilzers and pesticides on plants. Plants absorb these from the soil and thus these chemicals enters food chain. These chemicals eventually end up in hands of humans since human beings are top of food chain. Thus concentration of harmful chemical entering food chain will be maximum in humans.

Answer:

The correct option is B) Man.

Explanation:

Chemicals, such as pesticides, herbicides, and fertilizers, are used extensively in agriculture and other human activities. These chemicals can enter the environment through various pathways, including air, water, and soil. Once in the environment, they can accumulate in the food chain.

Man-made chemicals, including those used in agriculture and industry, have the potential to be highly toxic and harmful to living organisms. When these chemicals are released into the environment, they can contaminate water bodies and soil, which are then absorbed by plants and other organisms.

Here is a detailed explanation of why the concentration of harmful chemicals entering the food chain will be maximum in man:

1. Use of chemicals in agriculture:
- Man uses various chemicals, such as pesticides and fertilizers, in agricultural practices to increase crop yield and protect crops from pests and diseases.
- These chemicals are sprayed on crops, and some of them may be absorbed by the plants and stored in their tissues.

2. Bioaccumulation:
- When plants absorb chemicals from the environment, they can accumulate these chemicals in their tissues.
- The concentration of chemicals in plants may not be very high initially, but as they are consumed by animals, the chemicals get transferred and accumulate in higher trophic levels.

3. Biomagnification:
- Biomagnification is the process by which the concentration of a chemical increases as it moves up the food chain.
- When animals consume plants or other animals that have accumulated chemicals, they absorb these chemicals into their bodies.
- The chemicals can then be stored in the fatty tissues of animals and become more concentrated as they move up the food chain.

4. Human consumption:
- Humans are at the top of the food chain and consume a variety of plants and animals.
- As humans consume plants and animals that have accumulated chemicals, they also ingest these chemicals.
- Since humans are at the top of the food chain, the concentration of chemicals in their bodies can be significantly higher than in other organisms lower in the food chain.

Therefore, the concentration of harmful chemicals entering the food chain will be maximum in man, as they are at the top of the food chain and consume plants and animals that have accumulated these chemicals.