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

Given below are two statements:
Statement-$I$: Leaves originate from shoot apical meristems.
Statement-$II$: Leaves are arranged in acropetal order.
In the light of the above statements,choose the correct answer from the options given below:

Sheathing leaf base is found in $-$

In which of the following plants does the petiole expand, become green, and synthesize food?

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

$A$ rootless aquatic plant in which a portion of the leaf is modified to form a bladder for catching small aquatic animals is: