The metal ion involved in the stomatal regulation is,or stomata will open if there is an accumulation of the following element in the guard cells:

The stomatal apparatus consists of:

The stomatal pore is guarded by two kidney-shaped guard cells. Name the epidermal cells surrounding the guard cells. How does a guard cell differ from an epidermal cell? Use a diagram to illustrate your answer.

Opening of stomata is not affected by

If the rates of transpiration and water absorption of a flowering plant are measured over a period of $24$ hours,it is found that the rate of transpiration reaches its peak at about mid-day and then declines,whereas the peak for water absorption is reached approximately two hours later. Which one of the following statements provides the best explanation of these results?

Through which process is liquid exuded from the uninjured part of a leaf tip?