In some plants,the leaves drop down during the day while becoming normal during the night.

Stomatal opening is regulated by

In the mechanism of opening of stomata,the important factor is the

In barley type of plants,the stomata open:

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?

Hydathodes perform the function of