Assertion: Respiratory gas exchange occurs through osmosis.
Reason: Respiratory gas goes from lower partial pressure region to the region of higher partial pressure.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true ,but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but Reason is false
D. If both Assertion and Reason are false.

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "Respiratory gas exchange occurs through osmosis." We need to determine if this statement is true or false.

**Solution:**
- Osmosis is the movement of water molecules through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration. It specifically refers to the movement of water, not gases.
- Therefore, the assertion is **false** because respiratory gas exchange does not occur through osmosis.

### Step 2: Understand the Reason
The reason states that "Respiratory gas goes from lower partial pressure region to the region of higher partial pressure." We need to assess the validity of this statement.

**Solution:**
- In respiratory gas exchange, gases move from areas of higher partial pressure to areas of lower partial pressure. This is due to the principle of diffusion, where molecules move from a region of higher concentration (or partial pressure) to a region of lower concentration (or partial pressure).
- Therefore, the reason is also **false** because it incorrectly describes the direction of gas movement.

### Step 3: Conclusion
Since both the assertion and the reason are false, we conclude that the correct answer is that both the assertion and the reason are false.

**Final Answer:** Both assertion and reason are false.

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