Question

Grass stem elongates after initial growth due to

A
Apical meristem
B
Secondary meristem
C
Intercalary meristem
D
Lateral meristem
Solution
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In angiosperms, intercalary meristems occur only in monocot (in particular, grass) stems at the base of nodes and leaf blades. Horsetails also exhibit intercalary growth. Intercalary meristems are capable of cell division and they allow for rapid growth and regrowth of many monocots. Intercalary meristems at the nodes of bamboo allow for rapid stem elongation, while those at the base of most grass leaf blades allow damaged leaves to rapidly regrow. This leaf regrowth in grasses evolved in response to damage by grazing herbivores, but is more familiar to us in response to lawnmowers. Apical meristem helps in initial growth. Secondary meristem and lateral meristems helps in secondary growth.
Thus, the correct answer is option C.

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