A) tristichous
B) pentastichous
C) distichous
D) octastichous
Correct Answer: A
Solution :
The mode of arrangement of leaves on the stem is phyllotaxy. There are three categories of phyllotaxy which fall under two principal-cyclic and acyclic. In acyclic phyllotaxy, a single leaf is present at each mode. It is also known as spiral or alternate phyllotaxy. In cyclic phyllotaxy, more than one leaf is present at node. If three leaves are present at node at some angle (120°) forming whorl are know as tristichous. Therefore 120° phyllotaxy is found is tristichous.
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