On the basis of daily periodicity, stomatal movements are of

Options

A. Four types
B. Three types
C. Two types
D. Five types.

Answer

**Step-by-Step Solution:**

1. **Understanding Stomatal Movements:**
- Stomata are small openings on the surface of leaves that allow for gas exchange. Their movements are influenced by environmental conditions and can vary throughout the day.

2. **Daily Periodicity of Stomatal Movements:**
- Stomatal movements can be categorized based on their daily patterns of opening and closing. This periodicity is crucial for optimizing photosynthesis and transpiration.

3. **Identifying the Types:**
- Based on the daily periodicity, stomatal movements are classified into **5 types**:
- **Alpha-Alpha Type:** Stomata open during the day and close at night.
- **Barley Type:** Stomata remain open for only a few hours during the day and are closed for the rest.
- **Potato Type:** Stomata remain open throughout both day and night.
- **Equestrian Type:** Stomata seldom close, remaining open most of the time.
- **Succulent Type:** Stomata remain open at night and close during the day.

4. **Conclusion:**
- Therefore, the correct answer to the question is that stomatal movements, based on daily periodicity, are of **5 types**.

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