Leaf blade is spinous in case of

$A$: Reticulate venation is observed in the leaves of sunflower.
$R$: Sunflower is included in the class Dicotyledonae.

The tongue-like outgrowth found in the leaf of grasses is known as:

The leaf base is a modified form of .........

What is a leaf called that has stomata only on its upper surface?

$A$ compound leaf,which appears as a simple leaf due to the suppression of one or two leaflets,is found in which of the following plants?