Rachis is modified into a leafy structure called

In which type of leaf are all the leaflets attached to a common point?

$A$ long, thin, flexible $petiole$ allows leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surfaces.

Heterophylly means

In $Opuntia$,the spines are modifications of:

In sweet pea,the tendrils are modified: