The stomatal apparatus consists of:

Transpiration is minimised by the deposition of

Which of the following is not a controlled process?

The process of photosynthesis requires water. The system of xylem vessels from the root to the leaf vein can supply the needed water. But what force does a plant use to move water molecules into the leaf parenchyma cells where they are needed?

$Potassium$ ions play an important role in the opening and closing of stomata.

Which of the following factors is the most important in the regulation of transpiration?