How many histogens are present at the apex of root

Options

A. 1
B. 2
C. 3
D. 4

Answer

C

Explanation

Histogen theory was proposed by Hanstein. Acc to this theory shoot apex consists of 3 types of histogens.
(1) Dermatogen `to` Outer layer. It forms epidermis and epidermal tissue system.
(2) Periblem `to` It gives rise to the tissues. Between epidermis and state i.e. cortex and endodermis.
(3) Pleurome `to` Innermost layers the central mass of cells which gives rise to the central state.