Name the tissue which is present in the veins of leaves.

Give reasons for the following:
$(i)$ Bark of a tree is impervious to gases and water.
$(ii)$ In desert plants,epidermis has a thick waxy coating.
$(iii)$ Epidermal cells of the roots generally have hair-like parts.

Name the element$(s)$ of xylem which
$(i)$ help in transport of water and minerals,
(ii) stores food,and
(iii) provides mechanical support.

The water conducting tissue generally present in gymnosperms is

Meristematic tissues in plants are

Meristematic tissues in plants are