Question

Which of the following meristems is responsible for extra stellar secondary growth in dicotyledonous stem?

• A. Phellogen
• B. Intrafascicular cambium
• C. Interfascicular cambium
• D. Intercalary meristem

Answer 1

Answer: (A)

Phellogen

A. The permanent living cells in the outer cortical region become meristematic and give rise to a secondary lateral meristem called as cork cambium or phellogen. It is responsible for the extra stellar secondary growth.

B. Intrafascicular cambium is the cambium present between the primary xylemand primary phloem within the same vascular bundle.

C. Interfascicular cambium is the cambium present between the vascular bundles.

D. Intercalary meristem is the meristem lying in between the regions of permanent tissues. This meristem is responsible for the increased length of the plant parts.

So, the correct answer is 'Phellogen'.