The hormone 'X' does the following functions.
(i) Induces seed dormancy.
(ii) Inhibits seed germination.
(iii) Stimulates closureo of stomata. The hormone 'X' should be

Options

A. ABA
B. ethylene
C. GA
D. cytokinins

Answer

To determine the hormone 'X' based on the given functions, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Functions of the Hormone**:
- The hormone 'X' induces seed dormancy.
- It inhibits seed germination.
- It stimulates the closure of stomata.

2. **Understand Seed Dormancy**:
- Seed dormancy is a state in which seeds do not germinate even under favorable conditions. This is crucial for survival, allowing seeds to wait for optimal conditions.

3. **Link Functions to Known Hormones**:
- Among the plant hormones, abscisic acid (ABA) is known for its role in inducing seed dormancy and inhibiting germination.

4. **Closure of Stomata**:
- Abscisic acid is also recognized as a stress hormone that triggers the closure of stomata in response to water stress, helping the plant conserve water.

5. **Conclusion**:
- Given that abscisic acid is the only hormone that fulfills all three functions mentioned (inducing seed dormancy, inhibiting seed germination, and stimulating closure of stomata), we can conclude that the hormone 'X' is abscisic acid.

### Final Answer:
The hormone 'X' should be **abscisic acid (ABA)**.

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