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

Generally,the cells of the cortex lack $.....$.

The primary function of a vessel in plants is:

$A$ vascular bundle in which a group of xylem and a group of phloem are on the same radius with xylem near the pith and phloem near the cortex and both are not separated by the cambium,is called:

Write a note on the Ground Tissue System.

The $3$ types of tissue systems,namely epidermal,ground,and vascular tissue systems,were proposed by whom?