Stilt roots are found in . . . . . . .

Photosynthetic roots are recorded from

Pneumatophores are useful in

Draw a labelled diagram showing various regions of a root.

Asafoetida is found in the schizogenous ducts of the . . . . . . .

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?