Select the mismatched pair.

Options

A. Gibberellic acid - Increase yield of sugarcane
B. Cytokinin - Promotes apical dominance
C. Ethylene - Sprouting of potato tuber
D. Abscisic acid - Inhibits seed germination

Explanation

To solve the question of selecting the mismatched pair of phytohormones and their functions, we will analyze each pair provided in the question.

### Step-by-Step Solution:

1. **Identify the Phytohormones and Their Functions**: We are given several phytohormones along with their associated functions. We need to evaluate each pair to determine if they are correctly matched.

2. **Evaluate the First Pair - Gibberellic Acid**:
- **Phytohormone**: Gibberellic Acid (GA)
- **Function**: Increase yield of sugarcane.
- **Analysis**: Gibberellic Acid is known to promote growth and increase the yield of sugarcane by elongating the internodes. This pair is correctly matched.

3. **Evaluate the Second Pair - Cytokinins**:
- **Phytohormone**: Cytokinins
- **Function**: Promotes apical dominance.
- **Analysis**: Cytokinins are known to promote cell division and lateral bud growth, while auxins are responsible for apical dominance by inhibiting lateral bud growth. Therefore, this pair is incorrectly matched.

4. **Evaluate the Third Pair - Ethylene**:
- **Phytohormone**: Ethylene
- **Function**: Promotes sprouting of potato tubers.
- **Analysis**: Ethylene is indeed responsible for promoting the sprouting of potato tubers. This pair is correctly matched.

5. **Evaluate the Fourth Pair - Abscisic Acid**:
- **Phytohormone**: Abscisic Acid (ABA)
- **Function**: Inhibits seed germination.
- **Analysis**: Abscisic Acid is known to inhibit seed germination, making this pair correctly matched.

6. **Conclusion**: After evaluating all pairs, we find that the second pair (Cytokinins - Promotes apical dominance) is the mismatched pair, as auxins are the hormones that promote apical dominance.

### Final Answer:
The mismatched pair is **Cytokinins - Promotes apical dominance**.

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