Identify the cells that help in the opening of stomatal pores for the entry of carbon dioxide during daytime.

Options

A. Palisade cells
B. Guard cells
C. Mesophyll cells
D. Xylem

Explanation

**Step-by-Step Solution:**

1. **Understanding Stomata**: Stomata are small openings on the surface of leaves that allow gases to enter and exit the plant. They play a crucial role in the process of photosynthesis by facilitating the entry of carbon dioxide (CO2) and the release of oxygen (O2).

2. **Identifying the Key Cells**: The cells responsible for regulating the opening and closing of stomatal pores are known as guard cells. These specialized cells surround each stoma.

3. **Function of Guard Cells**: During the daytime, when photosynthesis occurs, guard cells absorb water and swell. This swelling causes the stomatal pores to open, allowing carbon dioxide to enter the leaf for photosynthesis.

4. **Closing of Stomata**: Conversely, when the guard cells lose water, they shrink, leading to the closing of the stomatal pores. This mechanism helps the plant conserve water during dry conditions.

5. **Conclusion**: Therefore, the cells that help in the opening of stomatal pores for the entry of carbon dioxide during daytime are the guard cells.

**Final Answer**: Guard cells.

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