The shape of guard cells changes due to change in the

Options

A. protein composition of cells
B. temperature of cells
C. amount of water in cells
D. position of nucleus in the cells

Explanation

**Step-by-Step Solution:**

1. **Understanding Guard Cells**: Guard cells are specialized cells that surround the stomata (small openings) on the surface of leaves. Their primary function is to regulate the opening and closing of these stomatal pores.

2. **Shape of Guard Cells**: The guard cells are typically shaped like dumbbells. This unique shape allows them to change their configuration to either open or close the stomatal pore.

3. **Role of Water**: The shape of guard cells changes in response to the amount of water present within them. When water enters the guard cells, they swell and become turgid, causing the stomatal pore to open.

4. **Opening of Stomata**: When guard cells take in water, they increase in volume, which leads to the bending of the cells away from each other. This bending action opens the stomatal pore, allowing for gas exchange and transpiration.

5. **Closing of Stomata**: Conversely, when water exits the guard cells, they lose turgor pressure and shrink. This shrinkage causes the guard cells to come closer together, leading to the closure of the stomatal pore.

6. **Conclusion**: The shape of guard cells changes due to the change in the amount of water inside them. Therefore, the correct answer to the question is that the shape of guard cells changes due to changes in the amount of water.

**Final Answer**: The shape of guard cells changes due to the change in the amount of water in the cells.

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