Which hormone is responsble for fruit ripening:

Options

A. Ethylene
B. Auxin
C. Ethyl chloride
D. Cytokinin

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks which hormone is responsible for fruit ripening.

2. **Review the Options**: The options provided are:
- A) Ethylene
- B) Auxin
- C) Ethyl Chloride
- D) Cytokinin

3. **Analyze Each Option**:
- **Ethylene**: This is a gaseous plant hormone known to play a crucial role in the ripening of fruits. It triggers various physiological processes that lead to ripening.
- **Auxin**: This hormone is primarily involved in growth processes and is known for inducing parthenocarpy (development of fruit without fertilization). It does not directly cause fruit ripening.
- **Ethyl Chloride**: This compound does not have a significant role in plant physiology related to fruit ripening.
- **Cytokinin**: This hormone is mainly involved in promoting cell division and growth, not in the ripening of fruits.

4. **Conclusion**: Based on the analysis, the hormone responsible for fruit ripening is **Ethylene**.

5. **Final Answer**: The correct answer is **A) Ethylene**.