Question

Quiescent centre occurs in

• A. Shoot apex
• B. Root apex
• C. Both A and B
• D. Meristematic tissue

Answer 1

Answer: (B)

Root apex

• The root-promeristems of higher plants have a central part called the quiescent centre.
• The cells here divide less frequently as they are inactive and are present at the pole of cortex and stele.
  
• They may consist of four cells (minimum) or can go up to 600 cells which show very low mitotic activity.
• In closed meristem, QC is hemispherical in shape whereas, in open meristem it is disc-shaped.
• The QC is unusual in the centre of shoots.

So, the correct answer is 'Root apex'