Which function is not correctly matched with the appropriate Phytohormone ?

Options

A. Apical hook formation dicot seedlings : Ethylene
B. Increase in the length of grapes stalks: Gibberellin
C. Induction of parthenocarpy in tomato : Auxin
D. Prevention of nutrient mobilization : cytokinin

Answer

To solve the question of which function is not correctly matched with the appropriate phytohormone, we will analyze each option step by step.

### Step 1: Understand Phytohormones
Phytohormones, or plant hormones, are chemical substances that regulate various physiological processes in plants. The main types include auxins, gibberellins, cytokinins, ethylene, and abscisic acid.

### Step 2: Analyze Each Match
We need to evaluate the provided matches of phytohormones and their functions.

1. **Ethylene - Apical Hook Formation (Dicot Seedling)**
- Ethylene is known to be involved in the formation of the apical hook in dicot seedlings, as well as in fruit ripening and senescence. This match is correct.

2. **Gibberellins - Increase Internodal Length**
- Gibberellins are indeed responsible for promoting stem elongation and increasing internodal length. This match is also correct.

3. **Auxins - Apical Dominance and Parthenocarpy**
- Auxins are primarily responsible for apical dominance, which is the phenomenon where the main central stem of the plant grows more strongly than the side stems. They also induce parthenocarpy, which is the development of fruit without fertilization. This match is correct.

4. **Cytokinins - Prevent Nutrient Mobilization**
- Cytokinins are known for promoting cell division and delaying senescence (aging) in plants. They help in nutrient mobilization rather than preventing it. Therefore, this match is incorrect.

### Step 3: Conclusion
Based on the analysis, the function that is not correctly matched with the appropriate phytohormone is:
**Cytokinins - Prevent Nutrient Mobilization.**

### Final Answer
The correct answer is option 4: Cytokinins - Prevent Nutrient Mobilization.

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