81.

Expanded green stem of Opuntia is called

• phylloclade

• tendril

• bulb

• cladode

Most of the economically important fibre yielding plants belong to family

• Malvaceae

• Solanaceae

• Cruciferae

• Paceae

Ginger is an underground stem. It is distinguished from root because

• it lacks chlorophyll

• it stores food

• it has nodes and internodes

• it has xylem and vessels

Floral formula of _{$\oplus ⚥$}k₅ C₅ A₅₊₅ G₁ is characteristic of the family

• Papilionaceae

• Caesalpinoideae

• Cruciferae

• Mimosoideae

The number of female flowers found in a cyanthium is

• one

• three

• two

• many

In turnip, 2/3 part of swollen area is derived from

• hypophysis

• hypocotyl

• epicotyl 

•  radicle

Which of the following represents the edible part of the fruit of litchi?

• Pericarp

• Mesocarp

• Juicy aril

• Endocarp

Commercial cork is obtained from

• Flax

• Juglans regia

• Hevea brassiliansis

• Quercus suber

The given formula belong to

_{$\mathrm{Br}\oplus ⚥{\mathrm{Epi}}_3{\mathrm{K}}_{\left(5\right)}{\stackrel{\curvearrowleft }{{\mathrm{C}}_5\mathrm{A}}}_{(\infty )}{\mathrm{G}}_{\left(5\right)}$}

• Solanaceae

• Malvaceae

• Graminae

• Compositae

Biologically most resistant plant material is

• sporopollenin

• cutin

• lignin

• suberin