Question

Plerome is a histogen that gives rise to

• A. Pericycle
• B. Pith
• C. Vascular bundles
• D. All of the above

Answer 1

The correct option is D All of the above

• The cells of the shoot apical meristem divide to form three distinct layers.

1) Dermatogen is the primary meristem that forms the outer most layer of a plant or a plant part and forms the epidermis.

2) Periblem is a primary meristem which is located between the plerome and the dermatogen and it forms the cortex.

3) Plerome is the primary meristem that forms the central core of a plant or plant part which gives rise to the stele (includes the vascular tissue, pith and pericycle).

• The part of plerome from which vascular tissues are formed is called procambium.
  
• All these layers are located at the shoot and root tip in plants as these are derived from the apical meristematic tissues according to the histogen theory given by Hanstein.
  

So, the correct answer is 'All of the above'.