Question

Which of the following meristems is responsible
for extrastellar secondary growth in dicotyledonous
stem?
(a) Intrafascicular cambium
(b) Interfascicular cambium
(c) Intercalary meristem
(d) Phellogen

Answer 1

Answer is option "d"

Explanation:

• Cork cambium or phellogen is a lateral meristem as it is responsible for increment in the thickness of the stem. It is auxiliary in starting point and optional in work. It offers to ascend to auxiliary tissues like plug and optional cortex. The phellogen cuts more cells on the external side and not many on the inward side.
• The external cells get submersed and structure the plug or phellem. The internal cells remain parenchymatous and along with these lines structure, the auxiliary cortex or phelloderm.
• The phones of medullary beams, which lie in the edge of the intrafascicular cambium likewise become dynamic and offer ascent to cambial strips called the interfascicular cambium.
• Hence, the right answer is option d "phellogen".