First slide

The Leaf

Question

Arrange the following plants with gradual increase in the number of leaves at each node.
A. Sunflower
B. Guava
C. Alstonia

Easy

A

A, B and C
B

B, A and C
C

A, C and B
D

C, B and A

Solution

Sunflower - one leaf at each node (alternate phyllotaxy)
Guava - two leaves at each node (opposite phyllotaxy)
Alstonia - more than two leaves at each node (whorled phyllotaxy)

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