Velamen tissue is required for ..........

Pneumatophores occur in

Secondary roots arise from

$A$: Epiphyllous roots arise from the margins of leaf lamina.
$R$: Epiphyllous roots help in vegetative reproduction.

In a longitudinal section of a root, starting from the tip and moving upwards, the four regions are arranged in which order?

Which of the following represents the correct sequence of the four regions of a root, starting from the root tip and moving upwards?