Assertion: For DNA replication RNA primer is needed.
Reason: Synthesis of new DNA chain is initiated by DNA polymerase.

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

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
**Assertion:** For DNA replication, RNA primer is needed.

- **Explanation:** During DNA replication, the enzyme DNA polymerase is responsible for synthesizing new DNA strands. However, DNA polymerase cannot initiate the synthesis of a new DNA strand on its own. It requires a short segment of RNA, known as an RNA primer, to provide a starting point for the addition of DNA nucleotides. This RNA primer is synthesized by the enzyme primase.

**Conclusion:** The assertion is true.

### Step 2: Analyze the Reason
**Reason:** Synthesis of new DNA chain is initiated by DNA polymerase.

- **Explanation:** DNA polymerase is indeed the enzyme that synthesizes new DNA strands by adding nucleotides to a pre-existing strand. However, it cannot start the synthesis of a new strand without the RNA primer. The role of DNA polymerase is to extend the RNA primer by adding DNA nucleotides, but it does not initiate the synthesis on its own.

**Conclusion:** The reason is also true, but it does not correctly explain the assertion.

### Final Conclusion
Both the assertion and the reason are true statements, but the reason does not provide the correct explanation for the assertion. Therefore, the correct answer is that both statements are true, but the reason is not the correct explanation for the assertion.