Respuesta :
Answer:
Guard cells
Explanation:
- The guard cells surround the stomata and help to control the opening and closing of stomata thus, affecting the rate of transpiration.
- The guard cells become swollen as they acquire potassium ions and thus, the stomatal opening becomes large. This leads to a drop in the water potential of the guard cell thus allowing the water to move in.
- When these guard cells lose water they become flaccid and the stomatal opening is closed.
- Thus, the guard cells control the opening and closing of the stomata to regulate gas and water exchange.