Stomata in grass leaf are

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

…$A$… are structures present in the epidermis of leaves. They regulate process of transpiration and …$B$… exchange. It is composed of two bean-shaped cells known as …$C$… cells.

Choose the correct combination of $A , B$ and $C$ from the following options

What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.

Plant fibres can originate from