Question

From the following matches.
(i) Cotton -Open aestivation
(ii) Lady's finger - Quincuncial aestivation
(iii) Cassia - Ascending imbricate aestivation
(iv) Bean -Descending imbricate aestivation
Which of these are correct?

• A. $\text{ (i), (iii) and (iv) }$
• B. $\text{ (iii) and (iv) }$
• C. $\text{ (ii), (iii) and (iv) }$
• D. All are correct

Answer 1

Answer: (B)

The form of arrangement of sepals or petals in the floral bud with regard to the other members of the same whorl is known as aestivation. There are 5 types of aestivation.
Open: Where the margins of adjacent petals do not overlap or touch one another, e.g., Cotton, Mustard, etc.
Valvate: Where the margins of the adjacent petals touch each other but without overlapping, e.g., Calatropis, Brassica.
Twisted: Where one margin of a petal overlaps regularly the margin of an adjacent petal, e.g., China rose, cotton, Lady's finger.
Imbricate: Where irregular overlapping of petals by one another occurs, in ascending imbricate type, the posterior petal that is odd one will be the innermost and overlapped by one margin of the two lateral petals. e.g., Gulmohar, cassia.
Quincuncial: Where the two petals are internal, two are external and the fifth one has one margin external and the other margin is internal, e.g., Guava.
Vexillary (descending imbricate aestivation): Where the large posterior petal both margins overlap lateral petals and lateral petal other margins overlap anterior petals, e.g., Pea, bean.