Choose the correct option with respect to spongy mesophyll in a dicot leaf.

In $Vallisneria$,stomata are

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:

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 $C$.

In $Pinus$ needle,vascular bundles are:

Palisade tissue is present on both sides of the leaf of