Stomata which remain closed during night and open only during the day for a few hours are of

Options

A. Barley or cereal type
B. Alfalfa type
C. Lucerne type
D. Potato type.

Answer

To solve the question regarding the type of stomata that remain closed during the night and open only during the day for a few hours, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of Stomata**: Stomata are small openings on the surface of leaves that allow for gas exchange. They typically open during the day to allow carbon dioxide in for photosynthesis and close at night to reduce water loss.

2. **Identify the Types of Stomatal Behavior**: There are different types of stomatal behavior based on their opening and closing patterns. The question specifies that we are looking for stomata that are closed at night and open only for a few hours during the day.

3. **Review the Given Options**: The options provided include:
- Barley and Cereal type
- Alpha-alpha and Eukaryotic type
- Potato type
- Other unspecified types

4. **Analyze Each Option**:
- **Barley and Cereal Type**: These stomata remain open only for a few hours during the day and are closed for the rest of the time, including the night.
- **Alpha-alpha and Eukaryotic Type**: These stomata open during the day and remain closed at night, but they do not specify being open only for a few hours.
- **Potato Type**: These stomata remain open during both day and night, except for a few hours in the evening.
- **Other Types**: Not specified, but likely do not fit the criteria given.

5. **Conclusion**: Based on the analysis, the stomata that remain closed during the night and open only for a few hours during the day are classified as the **Barley and Cereal type**.

### Final Answer:
The stomata which remain closed during the night and open only during the day for a few hours are of the **Barley and Cereal type**.

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