Question

a banyan tree has aerial root why

Answer 1

Older banyan trees are characterized by their aerial prop roots that grow into thick woody trunks which, with age, can become indistinguishable from the main trunk. Old trees can spread out laterally, using theseprop roots to cover a wide area

Answer 2

Because they have characteristics of aerial prop roots that grow into thick woody trunks which, with age, can become indistinguishable from the main trunk.