By identifying the shape of the potato, select the option that represents the causative agent for this condition

Options

A. Virus
B. Virion
C. Viroid
D. Prion

Answer

To solve the question regarding the causative agent for the condition affecting the potato, we will analyze each option provided and determine which one corresponds to the characteristics of the potato shape.

### Step-by-Step Solution:

1. **Identify the Shape of the Potato**:
- The potato is typically a tuber with a somewhat irregular, rounded shape. This shape is important for comparing it to the options given.

2. **Analyze the Options**:
- **Option 1: Virus**
- A virus is composed of genetic material (RNA or DNA) enclosed in a protein coat. The shape of a virus does not resemble that of a potato, as it is usually much smaller and has a distinct structure. Therefore, this option is incorrect.

- **Option 2: Virion**
- A virion is the complete, infective form of a virus outside a host cell. Similar to viruses, virions do not have a shape that matches that of a potato. Hence, this option is also incorrect.

- **Option 3: Viroid**
- Viroids are smaller than viruses and consist solely of a short strand of RNA without a protein coat. They do not have a covering, which makes their shape less defined and more similar to the irregular shape of a potato. This makes viroids a potential candidate for the causative agent.

- **Option 4: Prion**
- Prions are infectious agents composed of protein that cause neurodegenerative diseases. They do not resemble the shape of a potato either, as they are not cellular and do not have a defined shape similar to that of a potato. Thus, this option is incorrect.

3. **Conclusion**:
- After analyzing all the options, the only one that closely resembles the characteristics of the potato, particularly in terms of lacking a protective covering and having a simpler structure, is the **Viroid**. Therefore, the correct answer is **Viroid**.

### Final Answer:
The causative agent for the condition affecting the potato is **Viroid**.