Laticifers are found in ..........

$A$ student observed grass and $Hibiscus$ plants in his garden during noon. To his surprise,only the leaves of grass were found rolled inwards. The reason could be

$A$ vascular bundle without pith is

In what respect do the conducting elements of the $Xylem$ differ from each other?

$A$ vascular bundle is considered closed when:

The waxy substance secreted by epidermal cells on their outer walls is: