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. Phytophase - dsDNA

Answer

To solve the question of selecting the correct matched pair, let's analyze each of the given options step by step.

### Step 1: Analyze the first pair - Viroid and Naked Infective RNA
- **Definition of Viroid**: Viroids are infectious agents that consist solely of a short strand of circular RNA without any protein coat. They are smaller than viruses and can cause diseases in plants.
- **Match Evaluation**: Since viroids are indeed naked infectious RNA (no protein coat), this pair is correctly matched.

### Step 2: Analyze the second pair - Pyrons
- **Definition of Pyrons**: Pyrons (more commonly known as prions) are infectious proteins that can cause neurodegenerative diseases. They do not contain nucleic acids (DNA or RNA).
- **Match Evaluation**: Since prions are proteins and do not match with any RNA or nucleic acid-related terms, this pair is not correctly matched.

### Step 3: Analyze the third pair - Capsid
- **Definition of Capsid**: A capsid is the protein shell of a virus that encases its genetic material.
- **Match Evaluation**: Since viroids do not have a protein coat (capsid), this pair is also not correctly matched.

### Step 4: Analyze the fourth pair - Phytophase
- **Definition of Phytophase**: Phytophages are viruses that infect plants and usually have single-stranded RNA as their genetic material.
- **Match Evaluation**: While this definition is correct, it does not relate to viroids, which do not have a capsid or any viral structure. Therefore, this pair is also not correctly matched.

### Conclusion
After evaluating all the pairs, the only correctly matched pair is:
1. Viroid - Naked Infective RNA

### Final Answer
The correct option is the first pair: Viroid and Naked Infective RNA.

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