Assertion (A): The concentration of harmful chemicals is more in human beings.
Reason (R): Man is at the apex of the food chain.

Options

A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B. Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
C. Assertion is true but Reason is false.
D. Assertion is false and Reason is true.

Explanation

To analyze the given statements, we will break it down into steps:

### Step 1: Understand the Assertion
The assertion states that "The concentration of harmful chemicals is more in human beings." This refers to the concept of bioaccumulation and biomagnification in ecosystems.

**Hint:** Consider how chemicals accumulate in organisms at different levels of the food chain.

### Step 2: Explain Bioaccumulation and Biomagnification
Bioaccumulation occurs when organisms absorb harmful substances faster than they can eliminate them. Biomagnification is the process where the concentration of these harmful substances increases as you move up the food chain. For example, plants may absorb a small amount of a chemical, herbivores that eat these plants accumulate more, and then carnivores that eat these herbivores accumulate even more.

**Hint:** Think about how energy and chemicals flow through the food chain and how they concentrate at higher levels.

### Step 3: Understand the Reason
The reason states that "Man is at the apex of the food chain." This means that humans occupy the highest trophic level in most ecosystems, with no natural predators.

**Hint:** Reflect on the position of humans in the food web and what it means to be at the top.

### Step 4: Connect the Assertion and Reason
Since humans are at the top of the food chain, they are exposed to the highest concentrations of harmful chemicals due to biomagnification. Therefore, the assertion that harmful chemicals are more concentrated in humans is supported by the fact that they are at the apex of the food chain.

**Hint:** Consider how being at the top of the food chain affects the accumulation of toxins.

### Step 5: Conclusion
Both the assertion and the reason are true. The reason correctly explains the assertion because being at the apex of the food chain leads to higher concentrations of harmful chemicals in humans.

**Final Answer:** Both the assertion and reason are true, and the reason is the correct explanation of the assertion.

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