Descending imbricate aestivation occurs in the corolla of

Tamarindus

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Cassia

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Pisum

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Helianthus

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Solution

The correct option is C
Pisum

Aestivation refers to the positional arrangement of petals and sepals of the flower within a flower bud before it has opened. In pisum, descending imbricate aestivation is present. In descending imbricate aestivation, the posterior petal overlaps one margin of the two lateral petals. Another margin of such two lateral petals overlaps the two anterior petals that are united. Therefore the overlapping is in descending order. So, the correct answer is 'Pisum'.

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Similar questions

Q. Assertion :In imbricate aestivation, out of five petals, one is completely internal. One is completely external and in each of the remaining three petals, one margin is internal and the other is external.
Reason: Ascending imbricate aestivation is found in Cassia and gulmohar.

In Pisum sativum, the aestivation of corolla is

Find out the correctly matched pairs as to aestivation of petals: (i) Valvate-Calotropis, (ii) Twisted-Bean (iii) Imbricate - Cassia (iv) Vexillary-China Rose.

Q. Ascending imbricate corolla is found in

Q. Go through the following matches.

(i) China rose	Twisted aestivation
(ii) Calotropis	Valvate aestivation
(iii) Gulmohur	Ascending imbricate aestivation
(iv) Pea	Descending imbricate aestivation

Which of these are correct?

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