Root hair develop from the region of

What is the piliferous layer?

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

Find the odd one out with respect to radicle leaves (leaves arising from the root).

Roots have thorny branches in

Haustoria or sucking roots occur in