Assertion: In eukaryotes, both intron and exon are transcribed to form hnRNA
Reason: Splicing is required in prokaryotes.

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

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that in eukaryotes, both introns and exons are transcribed to form heteronuclear RNA (hnRNA).
- This is true because eukaryotic genes consist of coding sequences (exons) and non-coding sequences (introns). During transcription, both are included in the initial RNA transcript, known as hnRNA.

2. **Understanding the Reason**:
- The reason states that splicing is required in prokaryotes.
- This is false because prokaryotes do not have introns in their genes. Therefore, there is no need for splicing, which is the process that removes introns from hnRNA to produce mature mRNA in eukaryotes.

3. **Evaluating the Relationship**:
- The assertion is true (both introns and exons are transcribed in eukaryotes), but the reason is false (splicing is not required in prokaryotes).
- Since the reason does not correctly explain the assertion, we conclude that the assertion is true, but the reason is false.

4. **Conclusion**:
- The correct answer is that the assertion is true and the reason is false.

### Final Answer:
- Assertion: True
- Reason: False