In leaves,the position of protoxylem and protophloem are respectively:

The vertical section of a dorsoventral leaf through the lamina shows three main parts namely,epidermis,$A$,and vascular system. The epidermis,which covers the upper surface is $B$ and the lower surface is covered by $C$ of the leaf. Choose the correct combination of $A$,$B$,and $C$.

Identify the internal structure of the plant organs shown in the image below.

During water stress,the bulliform cells:
$(a)$ Become turgid
$(b)$ Become flaccid
$(c)$ Make the leaves curl inwards
$(d)$ Make the leaf surface exposed
The correct options are:

In many grasses,what is the significance of the presence of bulliform cells in the upper epidermis of leaves?

Bulliform cells are found in: