Elongation and improvement of shape of apple fruit is carried out by which of the following growth regulator ?

Options

A. Auxin
B. GA
C. Ethylene
D. ABA

Answer

### Step-by-Step Solution:

1. **Understanding Growth Regulators**: Growth regulators are substances that influence the growth and development of plants. They play crucial roles in various physiological processes, including fruit development.

2. **Identifying the Options**: The question provides four options:
- A) Oxyene
- B) GA (Gibberellin)
- C) Ethylene
- D) ABA (Abscisic Acid)

3. **Analyzing Each Option**:
- **Oxyene**: This is not a commonly recognized growth regulator in plant physiology.
- **Gibberellin (GA)**: Known for promoting stem elongation, seed germination, and fruit development. It is particularly effective in improving the shape of fruits.
- **Ethylene**: A hormone associated with fruit ripening and senescence, but not primarily responsible for elongation.
- **Abscisic Acid (ABA)**: Primarily involved in stress responses and inhibiting growth, not in elongation or shape improvement.

4. **Determining the Correct Answer**: Based on the analysis, Gibberellin (GA) is the growth regulator that promotes elongation and improves the shape of apple fruit.

5. **Conclusion**: The correct answer to the question is **B) GA (Gibberellin)**.