Question

Multiseriate vascular rays opposite to protoxylem occur in

• A. Old dicot root
• B. old dicot stem
• C. both old dicot root & old dicot stem
• D. old stem of palms

Answer 1

The correct option is C both old dicot root & old dicot stem

The multiseriate vascular rays are developed as a secondary growth in the dicot roots. These are made up of parenchyma and occur as pith rays and are also called as primary medullary rays. The vascular cambium (interfascicular cambium and fascicular cambium) produced by pericycle is responsible for the production of these pith rays.

So, the correct option is both old dicot root and old dicot stem'.