Which one of the following respones of plants to growth hormone is true for ethylene

Options

A. Decrease in flower abscission
B. Decreases in femaleness
C. Increase in fruit ripening
D. Increase in cell elongation.

Answer

To determine which response of plants to growth hormone is true for ethylene, we can analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Ethylene**: Ethylene is a plant hormone known for its role in various physiological processes, particularly in fruit ripening and the regulation of growth.

2. **Evaluating the Options**:
- **Option 1: Decrease in flower abscission**: Ethylene is known to promote flower and leaf abscission, not decrease it. Therefore, this option is incorrect.
- **Option 2: Decrease in femaleness**: Ethylene does not decrease femaleness in plants. In fact, it can influence the development of female flowers in some species, but this option does not accurately describe a primary response. Hence, this option is incorrect.
- **Option 3: Increase in fruit ripening**: Ethylene is widely recognized for its role in promoting fruit ripening. It accelerates the ripening process, making this option a strong candidate for being correct.
- **Option 4: Increase in cell elongation**: While some hormones like auxins are known to promote cell elongation, ethylene does not primarily function in this way. Therefore, this option is also incorrect.

3. **Conclusion**: After evaluating all options, the correct response of plants to growth hormone that is true for ethylene is **Option 3: Increase in fruit ripening**.

### Final Answer:
The correct option is **increase in fruit ripening**.

---