Primary root is the direct elongation of the

Botanical name of Radish 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?

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

Regions of the root from the base to the root tip are:

Which one is a fleshy root?