Question

Aestivation of petals in the flower of Hibiscus is
A. Valvate
B. Twisted
C. Imbricate
D. Vexillary

Answer 1

Hint: The other name of Aestivation in pea exfoliation. Aestivation refers to the arrangement of flower parts into the flower bud before blooming. There are mainly 5 types of Aestivations found. These are valvate aestivation, imbricate aestivation, twisted aestivation vexillary aestivation, and quincuncial aestivation

Complete answer: Hibiscus comprises five petals that remain free but creates an overlapping arrangement at the margin of the appendages. This is a type of twisted aestivation. Twisted Aestivation is also known as convoluted or contorted Aestivation. This type of Aestivation is found in cotton, ladyfinger, etc. So, option B is correct.
Valvate aestivation: Valvate aestivation does not involve any overlapping of petals but remains in a whorl by forming a contact at the margins. Mustard flower comprises Valvate aestivation.
Vexillary aestivation: vexillary aestivation follows a particular arrangement of petals which involves the presence of anterior petal at the inner and the largest posterior petals at the outer. Vexillary Aestivation is an example of a Tephrosia flower.
Imbricate aestivation. The aestivation which involves the overlapping of flower Petals but does not follow any party arrangement is known as the imbricate aestivation. Imbricate aestivation is found in Gulmohar flower.
Quincuncial Aestivation: Quincuncial Aestivation involves the descending imbricate arrangement. Quincuncial Aestivation is noticed in Ranunculus.
So, the correct answer is “Option B”.

Note: The family Malvaceae comprises the plant Hibiscus. There are various species of Hibiscus found in nature. It is also known as rose mallow. Aestivation is one of the important factors for the classification of flowers. To observe Aestivation, sectioning of the flower is considered the best way.