Question

Match column-I containing types of aestivation with their examples given in column-II and choose the correct option.

Column I (Types of aestivation)	Column II ( Examples)
A. Valvate	I. Cotton
B. Twisted	II. Calotropis
C. Imbricate	III. Bean
D. Vexillary	IV. Gulmohur

• A. A – II; B – IV; C – I; D – III
• B. A – II; B – I; C – III; D – IV
• C. A – I; B – II; C – IV; D – III
• D. A – II; B – I; C – IV; D – III

Answer 1

The correct option is D A – II; B – I; C – IV; D – III

The arrangement of perianth members (sepals or petals) in bud condition with respect to each other is called aestivation. The different types of aestivation are valvate, twisted, imbricate and vexillary aestivation.

A: Valvate aestivation - In this sepals or petals just touch one another without any overlapping, E.g. Calotropis.
B: Twisted aestivation - In this one margin of each petal overlaps the margin of an adjacent petal in a regular manner. E.g. China rose, Cotton.
C: Imbricate aestivation: If the margin of sepals or petals overlap one another but not in any particular direction as in Cassia and Gulmohar, the aestivation is called imbricate. In this case, one perianth member is completely internal, one is completely external and the remaining are overlapping.
D: Vexillary aestivation - It is the characteristic aestivation of the corolla of pea when the posterior petal is outermost. The standard petal is completely external, the wing or the alae is overlapping and the keel petals are fused and are completely internal. E.g, Beans.