Assertion :- RNA viruses having shorter life span and evolve faster.
Reason : In RNA rate of mutations is slower than DNA.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are trur but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is Flase.
D. If both Assertion & Reason are false.

Answer

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

### Step 1: Analyze the Assertion
**Assertion:** RNA viruses having shorter lifespan and evolve faster.
- RNA viruses are known to have a shorter lifespan compared to DNA viruses. This is primarily due to the instability of RNA as a genetic material.
- RNA is typically single-stranded and more reactive, which makes it prone to mutations.
- The rapid mutation rate allows RNA viruses to evolve quickly, adapting to new environments or hosts.

**Conclusion for Assertion:** This statement is true.

### Step 2: Analyze the Reason
**Reason:** In RNA, the rate of mutations is slower than DNA.
- This statement is incorrect. In fact, RNA viruses generally have a higher mutation rate compared to DNA viruses.
- DNA is more stable due to its double-stranded structure, which provides a template for error correction during replication.
- RNA, being single-stranded and more reactive, does not have the same level of error correction, leading to a higher mutation rate.

**Conclusion for Reason:** This statement is false.

### Step 3: Combine the Conclusions
- The assertion is true: RNA viruses have a shorter lifespan and evolve faster.
- The reason is false: the mutation rate in RNA is actually faster than in DNA.

### Final Answer
The correct answer is that the assertion is true, but the reason is false.