What is the function of a guard cell?
To increase the surface area for gaseous exchange.
How does the cell wall of a guard cell and the chloroplasts help the stomata carry out its function?
The Guard cells control the openings of the stoma in plants. When light hits the guard cells, it caused the cell to pump potassium ions into the guard cells. As potassium is pumped into the guard cell, the water potential decreases. This drop in water potential causes the water from the intercellular spaces and surrounding cells to enter the guard cell increasing the turgidity and opening the stoma. The loss of potassium, and the increase…
The function of the guard cells are that they help to regulate the rate of transpiration by opening and closing the stomata thus preventing excessive water loss. The guard cell opens when there is too much water. It is also adapted for gas exchange between plants and environment. For example, it opens during rainy days and closes when the weather is too dry or windy. They also control the size of the pore.