Assertion: In eukaryotes, transcription occurs in nucleus.
Reason: In bacteria, transcription occurs in cytoplasm.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reson are true but reason is not the correct explanation of 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-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "In eukaryotes, transcription occurs in the nucleus."
- This is true because eukaryotic cells have a defined nucleus where the DNA is located, and transcription (the process of synthesizing RNA from DNA) occurs within this nucleus.

**Hint**: Recall the structure of eukaryotic cells and where their genetic material is housed.

2. **Understanding the Reason**:
- The reason states that "In bacteria, transcription occurs in the cytoplasm."
- This is also true. Bacteria are prokaryotic organisms that lack a defined nucleus; therefore, their transcription occurs in the cytoplasm where their DNA is located.

**Hint**: Consider the differences between prokaryotic and eukaryotic cells regarding cellular compartments.

3. **Evaluating the Relationship**:
- While both the assertion and the reason are true, we need to determine if the reason correctly explains the assertion.
- The reason discusses the transcription process in bacteria, which does not provide an explanation for why transcription occurs in the nucleus of eukaryotes.

**Hint**: Analyze if the reason directly supports or explains the assertion.

4. **Conclusion**:
- Since both statements are true but the reason does not explain the assertion, the correct answer is that both the assertion and reason are true, but the reason is not a correct explanation for the assertion.

**Final Answer**: Option B - Both assertion and reason are true, but the reason is not a correct explanation for the assertion.