On the margins of leaves of a plant called Bryophyllum tiny plants grow complete with roots. These tiny plants fall of and continue to grow. This is a form of

Assertion : A simple leaf has undivided lamina.
Reason : Leaves showing pinnate and palmate venation have various types of incisions

Name the plant having reticulate venation

$A$-Leaves originate from lateral meristem and arranged in an acropetal order

$R$- They are the most important vegetative organ for photosynthesis

Phyllotaxis is

Describe modification of leaves for specific functions with example.