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What is aestivation in flowers? Describe imbricate and vexillary aestivation with one example each.
CLASS 11 CBSE

Answer 1

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Aestivation means arrangement of accessory floral organs(sepals or petals) in relation to one another in a flower.

Some types of Aestivation:

-Open: Margins of adjacent petals are not overlapping / touching others.

-Valvate: Margins of the adjacent petals touch each other but without overlapping ex: Brassica

-Twisted: One margin of a petal overlaps regularly the margin of an adjacent petal.

ex: Chinarose

-Imbricate: Irregular overlapping of petals by one another.

ex: cassia.

[Note: desending Imbricate Aestivation is also called as Vexillary Aestivation. example: pea]

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