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Question

Given below are the number of leaves of successive nodes in different orthostiches in a plant having alternate phyllotaxy. What is the angle of leaf divergence ?
694366_8aa2a2edd11a4d07b2d45f2892f9b6c0.png

A
1800
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B
1200
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C
1350
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D
1600
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Solution

The correct option is B 1200
B. 120°
Reason: In the common sedge (Cyperus rotundus) the leaves are three-ranked (three orthostichies); the fourth leaf is above the first leaf, fifth above second, sixth above third and so on. Three leaves lie in one circle of the genetic spiral. Hence, angular divergence = 1/3 of 360° = 120° or 1/3 phyllotaxy.

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