In $Vallisneria$,stomata are

Palisade parenchyma is absent in the leaves of .....

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 $C$.

The largest number of chloroplasts is found in:

Bulliform cells are found in:

Identify $a, b, c, d$ from the given figure of a leaf cross-section: