Identify the correct pair of combination
(i) Zeatin - adenine derivative - overcoming apical dominance
(ii) `C_(2)H_(4)` - indole compound - effective in fruit ripening
(iii) ABA - carotenoid derivative - induction of parthenocarpy
(iv) `Ga_(3)` - terpene - bolting in cabbage

Options

A. ii, iii
B. ii, iv
C. i, iv
D. iii, iv.

Answer

To solve the question, we need to analyze each of the given combinations and determine their correctness based on our knowledge of plant hormones and their functions.

### Step-by-Step Solution:

1. **Analyze the first combination: Zeatin - adenine derivative - overcoming apical dominance**
- Zeatin is indeed a derivative of adenine and is classified as a cytokinin. Cytokinins are known to promote cell division and are involved in overcoming apical dominance by promoting lateral shoot growth.
- **Conclusion**: This combination is **correct**.

2. **Analyze the second combination: C₂H₄ - indole compound - effective in fruit ripening**
- C₂H₄ is ethylene, which is a gaseous plant hormone responsible for fruit ripening. However, it is not an indole compound; rather, indole compounds are associated with auxins (like indole-3-acetic acid).
- **Conclusion**: This combination is **incorrect**.

3. **Analyze the third combination: ABA - carotenoid derivative - induction of parthenocarpy**
- Abscisic acid (ABA) is indeed a carotenoid derivative, but it is primarily involved in processes such as seed dormancy and stress responses, not in the induction of parthenocarpy. Parthenocarpy is typically induced by auxins.
- **Conclusion**: This combination is **incorrect**.

4. **Analyze the fourth combination: Ga₃ - terpene - bolting in cabbage**
- Gibberellins (Ga₃) are indeed plant hormones that promote growth and are known to induce bolting in plants such as cabbage. However, gibberellins are not classified as terpenes; they are a different class of plant hormones.
- **Conclusion**: This combination is **incorrect** in terms of classification but correct in terms of function.

### Final Answer:
The only correct pair from the combinations provided is the first one:
- **(i) Zeatin - adenine derivative - overcoming apical dominance.**