Assertion :- RNA is not a predominant genetic material.
Reason : RNA being unstable, mutate at faster

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

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "RNA is not a predominant genetic material." This implies that in most organisms, DNA is the primary genetic material, while RNA plays a lesser role.

2. **Understanding the Reason**: The reason provided is "RNA being unstable, mutates at a faster rate." This suggests that the inherent instability of RNA contributes to its higher mutation rate compared to DNA.

3. **Analyzing the Relationship**: To evaluate the assertion and reason, we need to determine if the reason supports the assertion. RNA is indeed less stable than DNA due to its structure (single-stranded and the presence of the hydroxyl group on the ribose sugar), which makes it more prone to degradation and mutations.

4. **Conclusion**: Since RNA is less stable and mutates faster, it is not favored as the predominant genetic material in most organisms. Instead, DNA, which is more stable and has a lower mutation rate, has evolved to serve as the primary genetic material. Therefore, the reason correctly explains why the assertion is true.

5. **Final Answer**: The assertion is true, and the reason is also true, and the reason correctly explains the assertion. Thus, the correct answer is that both the assertion and reason are true, and the reason supports the assertion.