Go through the following matches
(i) Abcisic acid - Delays senescence
(ii) Auxins - Control xylem
(iii) Gibberellins -Cause fruits like apple to elongate and improve its shape
(iv) Cytokinins - Promotes apical domiance caused by auxins
Which of these are correct :

Options

A. (ii) & (iii)
B. (ii),(iii) & (iv)
C. (i),(iii) & (iv)
D. (ii),(iii) & (iv)

Explanation

To determine which of the matches regarding plant hormones are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyzing Abscisic Acid:**
- The statement claims that abscisic acid delays senescence.
- However, abscisic acid is primarily known as a stress hormone that promotes leaf abscission (the dropping of leaves) and can actually induce senescence rather than delay it.
- **Conclusion:** This statement is **incorrect**.

2. **Analyzing Auxins:**
- The statement claims that auxins control xylem.
- Auxins are indeed a class of plant hormones that play a crucial role in various growth processes, including the regulation of xylem differentiation and elongation.
- **Conclusion:** This statement is **correct**.

3. **Analyzing Gibberellins:**
- The statement claims that gibberellins cause fruits like apples to elongate and improve their shape.
- Gibberellins are known to promote stem elongation, seed germination, and fruit development, including the elongation of fruits.
- **Conclusion:** This statement is **correct**.

4. **Analyzing Cytokinins:**
- The statement claims that cytokinins promote apical dominance caused by auxins.
- In reality, cytokinins are known to promote cell division and can actually counteract apical dominance, which is primarily maintained by auxins.
- **Conclusion:** This statement is **incorrect**.

### Summary of Correct Matches:
- Only the second (Auxins - Control xylem) and third (Gibberellins - Cause fruits like apple to elongate and improve its shape) statements are correct.

### Final Answer:
The correct matches are: **(ii) Auxins - Control xylem** and **(iii) Gibberellins - Cause fruits like apple to elongate and improve its shape**.