Arrangement of sepals and petals with respect to each other in flower bud is

Aestivation

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Phyllotaxy

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Vernation

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Venation

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Solution

The correct option is D Aestivation
Arrangement of sepals and petals with respect to each other in flower bud is aestivation. Aestivation or estivation refers to the positional arrangement of the parts of a flower within a flower bud before it has opened. Aestivation is also sometimes referred to as praefoliation or prefoliation, but these terms may also mean vernation that is the arrangement of leaves within a vegetative bud.
Therefore, the correct answer is option A.

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