Assertion :- 28S rRNA in bacteria act as a ribozyme.
Reason:- It is a main component for the formation of phosphodiester bond.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & 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 "28S rRNA in bacteria acts as a ribozyme."
- However, it is important to note that in bacteria, the ribosomal RNA that acts as a ribozyme is actually the 23S rRNA, not the 28S rRNA. The 28S rRNA is found in eukaryotes, specifically in the large subunit of the ribosome.

2. **Understanding the Reason**:
- The reason states that "It is a main component for the formation of phosphodiester bond."
- While rRNA does play a role in catalyzing the formation of peptide bonds (not phosphodiester bonds), the assertion is still incorrect because it incorrectly identifies the type of rRNA involved.

3. **Evaluating the Truth of Assertion and Reason**:
- Since the assertion is false (28S rRNA is not present in bacteria and does not act as a ribozyme), and the reason is also misleading (it refers to the wrong type of bond), we conclude that both the assertion and reason are false.

4. **Conclusion**:
- Therefore, the correct answer is option D: both assertion and reason are false.

### Final Answer:
- **Both assertion and reason are false.** (Option D)