Consider the following statements
1. In climacteric fruits, ethylene production is high.
2. Gibberellin present in a healthy stem causes some of the new cells to differ- entiate as phloem.
3. Loss of turgor in leaves stimulates the production of abscisic acid.
Which of the statements given above are correct?

Options

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3

Answer

To determine which of the statements regarding plant hormones and their effects are correct, we can analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement 1: In climacteric fruits, ethylene production is high.**
- **Analysis:** Climacteric fruits are known for their ripening process, which is significantly influenced by ethylene. Ethylene is a plant hormone that promotes ripening, and its production increases during this phase. Therefore, this statement is **correct**.

2. **Statement 2: Gibberellin present in a healthy stem causes some of the new cells to differentiate as phloem.**
- **Analysis:** Gibberellins are hormones that promote growth and are involved in various developmental processes, including stem elongation and differentiation. While auxins primarily influence the differentiation of vascular tissues, gibberellins also play a role in the overall growth and differentiation processes. Thus, this statement is also **correct**.

3. **Statement 3: Loss of turgor in leaves stimulates the production of abscisic acid.**
- **Analysis:** Abscisic acid (ABA) is known as a stress hormone in plants. When there is a loss of turgor pressure in leaves, which can occur during drought or water stress, the plant responds by producing ABA to help manage the stress. This statement is therefore **correct**.

### Conclusion:
All three statements are correct. Therefore, the answer is that **statements 1, 2, and 3 are correct**.