Parallel venation is found in ..........

Sheathing leaf base is found in $-$

Two chief functions of leaves are

Stomata in grass leaf are

Leaves of dicotyledonous plants possess . . . . . . venation,while . . . . . . venation is the characteristic of most monocotyledons.

Which of the following two are the resultant of stipule modifications?
$I$. Spines in $Ziziphus$.
$II$. Tendrils in $Smilax$.
$III$. Tendrils in $Nepenthes$.
$IV$. Spines in $Argemone$.
$V$. Thorns in $Bougainvillea$.