First slide

The Leaf

Question

Choose the pair of plants that have two leaves at every node.

Easy

A

China-rose and Mustard
B

Sun flower and Alstonia
C

Calotropis and Guava
D

Nerium and Alstonia

Solution

Alternate phyllotaxy - one leaf is present at every node. It is the most common type of phyllotaxy. Ex: China-rose, mustard, Sun flower, families like Brassicaceae, Fabaceae, Solanaceae and Liliaceae.
Opposite phyllotaxy - Two leaves are present at every node opposite to each other. It is common in Lamiaceae, Verbanaceae Ex: Guava, Calotropis
Whorled phyllotaxy - More than two leaves are present at every node. Ex: Alstonia, Nerium

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