A:Chloroplast is a semi-autonomous organelle. R: The ribosomes of the chloroplast are smaller than cytoplasmic ribosomes

Options

A. if both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark(1).
B. if both Assertion & Reason are true and the reason is not
the correct explanation of the assertion, then mark(2).
C. if Assertion is the ture statement but Reason is false, then mark(3)
D. if both Assertion and Reaosn are false statements, then mark(4)

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that "Chloroplast is a semi-autonomous organelle."
- A semi-autonomous organelle is one that can replicate independently within the cell and has its own genetic material.
- Chloroplasts contain their own DNA (cpDNA) and can replicate independently of the cell's nuclear DNA. This characteristic confirms that the assertion is true.

2. **Understanding the Reason:**
- The reason states that "The ribosomes of the chloroplast are smaller than cytoplasmic ribosomes."
- Chloroplasts have ribosomes that are similar to prokaryotic ribosomes, which are smaller (70S) compared to eukaryotic ribosomes found in the cytoplasm (80S).
- This statement is also true.

3. **Evaluating the Relationship Between Assertion and Reason:**
- While both the assertion and the reason are true, the reason does not explain why chloroplasts are considered semi-autonomous.
- The assertion is based on the presence of DNA and the ability to replicate, while the reason focuses solely on ribosome size, which does not directly relate to the semi-autonomous nature of chloroplasts.

4. **Conclusion:**
- Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.
- Therefore, the correct answer is that the assertion is true, the reason is true, but the reason is not the correct explanation for the assertion.

**Final Answer:**
- Assertion (A) is true.
- Reason (R) is true.
- R is not the correct explanation for A.

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