In $Dahlia$,the roots are

In $Ipomoea\, batatas$ (Sweet potato),the food is stored in:

In plants,lateral roots arise from

The plant which bears clinging roots is

Pneumatophores have lenticels for

What is meant by modification of root? What type of modification of root is found in the:
$(a)$ Banyan tree
$(b)$ Turnip
$(c)$ Mangrove trees