Read the following passage
Human body is made up of five important components, of which water is the main component. Food as well as potable water is essential for every human being. The food is obtained from plants through agriculture, Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradable, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body.
Various steps in a food chain represent:

Options

A. Food web
B. Trophic level
C. Ecosystem
D. Biomagnification

Explanation

### Step-by-Step Text Solution:

1. **Understanding the Passage**: The passage discusses the human body, its components, and the impact of pesticides on health through the food chain. It emphasizes the importance of water and food, and how pesticides used in agriculture can accumulate in organisms, particularly humans.

2. **Identifying Components of the Food Chain**: The food chain is a series of organisms each dependent on the next as a source of food. In the example provided, plants are the primary producers, followed by herbivores (like grasshoppers), then carnivores (frogs, snakes), and finally apex predators (eagles).

3. **Trophic Levels**: Each step in the food chain represents a trophic level. The first level consists of producers (plants), the second level consists of primary consumers (herbivores), the third level consists of secondary consumers (carnivores), and the fourth level consists of tertiary consumers (top predators).

4. **Chemical Accumulation**: The passage highlights that pesticides are not biodegradable and accumulate at each trophic level. This means that as you move up the food chain, the concentration of these harmful chemicals increases, affecting the health of organisms at the top, including humans.

5. **Conclusion**: The question asks about the various steps in a food chain, which correspond to the trophic levels. The correct answer is that these steps represent the different levels of energy transfer and feeding relationships in an ecosystem.

### Final Answer:
The various steps in a food chain represent the trophic levels, which include producers, primary consumers, secondary consumers, and tertiary consumers.

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