In $Opuntia$,the spines are modifications of:

Leaves are modified into spines in xerophytic structures called:

In which type of leaf are stomata equally distributed on both surfaces?

Which of the following features would distinguish a monocot from a dicot plant?

$A$-Leaves originate from shoot apical meristem and are arranged in an acropetal order.
$R$-They are the most important vegetative organ for photosynthesis.

Draw diagrams of a typical monocot and dicot leaves to show their venation pattern.