Choose the pair of plants that have alternate phyllotaxy
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a
Mustard and Sunflower
b
China-rose and Alstonia
c
Calotropis and Guava
d
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, Sunflower, 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, CalotropisWhorled phyllotaxy - More than two leaves are present at every node. Ex: Alstonia, Nerium