$A$ root hair is:

Roots obtain oxygen from air in the soil for respiration. In the absence or deficiency of $O_{2}$,root growth is restricted or completely stopped. How do the plants growing in marsh lands or swamps obtain their $O_{2}$ required for respiration?

An obligate root parasite is:

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

The type of roots present in mustard plant is

Rhizophora is an example of