Epiphyllous roots in $Begonia$ and $Bryophyllum$ are

Asafoetida $(Hing)$ is obtained from $Ferula$ $assa-foetida$. What is it?

In $Pandanus$ $(Screw\, Pine)$,the root cap is:

Velamen tissue in orchids is found in

Select the correct statements.
$I$. From the region of elongation,some of the epidermal cells form root hairs.
$II$. Pneumatophores are seen in $Rhizophora$.
$III$. Adventitious roots are seen in the banyan tree.
$IV$. Maize and sugarcane have prop roots.

Pneumatophores are found in plants that grow in .............