Q.

If in the arrangement of petals of a flower  bud, each petal has one margin inside and one margin outside, the arrangement is described as

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a

Valvate aestivation

b

Imbricate aestivation

c

Vexillary aestivation

d

Twisted aestivation

answer is D.

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Detailed Solution

In twisted aestivation, each petal/sepal/perianth lobe of whorl has one margin overlapped and one margin underlapped as in corolla of Cotton, China-rose and Lady's finger.
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If in the arrangement of petals of a flower  bud, each petal has one margin inside and one margin outside, the arrangement is described as