Select the correct option for the matched pair.

Options

A. Viroid - Naked infective RNA
B. Prion - Infectious protein affecting only plants
C. Capsid - protein coat of viroid
D. Phytophage - dsDNA

Answer

To solve the question regarding the matched pairs, we will analyze each statement one by one to determine which one is correct.

### Step 1: Analyze the first statement about Viroids
- **Statement**: "Viroid is a naked infective RNA."
- **Explanation**: Viroids are indeed small, circular RNA molecules that do not have a protein coat. They are known to cause diseases in plants. This statement is correct.

### Step 2: Analyze the second statement about Prions
- **Statement**: "Prions are infectious proteins affecting only plants."
- **Explanation**: Prions are infectious proteins that cause neurodegenerative diseases in animals, not plants. They are associated with diseases such as mad cow disease and Alzheimer's. This statement is incorrect.

### Step 3: Analyze the third statement about Capsid
- **Statement**: "Capsid is a protein coat of the Viroid."
- **Explanation**: Viroids do not have a capsid; they are simply made of RNA without any protein coat. The capsid is a protein coat found in viruses. This statement is also incorrect.

### Step 4: Analyze the fourth statement about Phytophage
- **Statement**: "Phytophage is double stranded DNA."
- **Explanation**: Phytophagous viruses (or phytophages) typically contain single-stranded RNA, not double-stranded DNA. An example is the Tobacco Mosaic Virus. This statement is incorrect.

### Conclusion
After analyzing all the statements, the only correct matched pair is the first one regarding Viroids.

### Final Answer
The correct option for the matched pair is:
**Option 1: Viroid is a naked infective RNA.**

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