To increase sugar production in sugarcanes, they are sprayed with

Options

A. IAA
B. Cytokinin
C. Gibberellin
D. Ethylene

Answer

To solve the question regarding which substance is sprayed on sugarcane to increase sugar production, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which substance is used to increase sugar production in sugarcane. The options provided are IAA (Indole Acetic Acid), Cytokinin, Gibberellin, and Ethylene.

2. **Identify the Role of Each Substance**:
- **IAA (Indole Acetic Acid)**: This is a type of auxin that promotes cell elongation and is involved in various growth processes. However, it primarily affects the elongation of roots and shoots, not specifically sugar production.
- **Cytokinin**: This hormone promotes cell division and can influence lateral growth, but it does not directly increase sugar production in sugarcane.
- **Gibberellin**: This hormone is known to promote stem elongation and can enhance the growth of the plant. It is particularly effective in increasing the length of the stem, which can lead to an increase in sugar storage capacity.
- **Ethylene**: This hormone is primarily involved in the ripening of fruits and does not play a significant role in increasing sugar production in sugarcane.

3. **Determine the Correct Answer**: Given that gibberellin promotes stem elongation, which directly impacts the sugar storage capacity of sugarcane, the correct answer is **Gibberellin**.

4. **Conclusion**: Therefore, to increase sugar production in sugarcanes, they are sprayed with **Gibberellin**.

### Final Answer: Gibberellin

---