Select the incorrect statement.

Options

A. Most plant viruses are RNA viruses.
B. Bacteriophages possess dsDNA.
C. Virus having an arthropod as vector is called as arbovirus.
D. Prions possess only nucleoid and no proteins.

Explanation

To solve the question of selecting the incorrect statement, we will analyze each statement provided and determine its validity step by step.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- Statement: "Most plant viruses are RNA viruses."
- Evaluation: This statement is true. The majority of viruses that infect plants are indeed RNA viruses.
- Conclusion: This statement is correct.

2. **Analyze the Second Statement:**
- Statement: "Bacteriophage possess double-stranded DNA (dsDNA)."
- Evaluation: This statement is also true. Bacteriophages, which are viruses that infect bacteria, typically contain double-stranded DNA.
- Conclusion: This statement is correct.

3. **Analyze the Third Statement:**
- Statement: "Virus having an arthropod as vector is called an arbovirus."
- Evaluation: This statement is true. Viruses that are transmitted by arthropods (like mosquitoes and ticks) are classified as arboviruses.
- Conclusion: This statement is correct.

4. **Analyze the Fourth Statement:**
- Statement: "Prions possess only nucleotide, no proteins."
- Evaluation: This statement is incorrect. Prions are misfolded proteins and do not contain nucleic acids (like DNA or RNA). They are solely composed of protein.
- Conclusion: This statement is incorrect.

### Final Answer:
The incorrect statement is: **"Prions possess only nucleotide, no proteins."**

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