In epiphytes,where are the velamen cells found?

Stilt roots are reported from

Give scientific reasons: The root of the $Rhizophora$ plant is called a breathing root.

The region of the root present just above the root cap is called the region of

Root cap is not found in

Name the body part modified for food storage in the following:
$(a)$ Carrot
$(b)$ Colocasia
$(c)$ Sweet potato
$(d)$ Asparagus
$(e)$ Radish
$(f)$ Potato
$(g)$ Dahlia
$(h)$ Turmeric
$(i)$ Gladiolus
$(j)$ Ginger
$(k)$ Portulaca