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Q.

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

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a

China-rose and Mustard

b

Sunflower and Alstonia

c

Calotropis and Guava

d

Nerium and Alstonia

answer is D.

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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, CalotropisWhorled phyllotaxy - More than two leaves are present at every node. Ex: Alstonia, Nerium
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