Choose the pair of plants that have alternate phyllotaxy.

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China-rose and Mustard

Sunflower and Alstonia

Calotropis and Guava

Guava and Alstonia

answer is A.

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Detailed 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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