Which one of the following is a physical factor that induce mutation ?

Options

A. Acridines
B. `HNO_(2)`
C. `UV`-Rays
D. Base analogue

Answer

**Step-by-Step Solution:**

1. **Understanding Mutations**: Mutations are changes in the gene structure. They can occur due to various factors, which are known as mutagens.

2. **Types of Mutagens**: Mutagens are classified into three categories:
- Physical mutagens (e.g., radiation, heat)
- Chemical mutagens (e.g., acridines, nitrous acid, base analogs)
- Biological mutagens (e.g., viruses, bacteria)

3. **Analyzing the Options**: The given options are:
- Acridines
- HNO2 (Nitrous acid)
- UV rays
- Base analog

4. **Identifying the Physical Mutagen**:
- Acridines, nitrous acid, and base analogs are all chemical mutagens.
- UV rays are a type of radiation and thus fall under the category of physical mutagens.

5. **Conclusion**: Among the options provided, the only physical factor that induces mutation is **UV rays**.

**Final Answer**: UV rays (Option C) are the physical mutagens that induce mutations.

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