Epidermal cells are often modified to perform specialised functions in plants. Name some of them and function they perform.

Select correct features w.r.t. trichomes in shoot system
$(a)$ Usually unicelled
$(b)$ Branched or unbranched
$(c)$ May be secretory
$(d)$ Soft or stiff
$(e)$ Helps against transpiration

Epidermal outgrowths are known as

In monocotyledons, they do not form secondary phloem and xylem why?

Write a note on the Vascular Tissue System.