Question

Vexillary aestivation is characteristic of the family
A.Fabaceae
B.Asteraceae
C.Solanaceae
D.Brassicaceae

Answer 1

Hint:There are five petals in Vexillary Aestivation. The two lateral petals (called wings), which further overlap the two smallest anterior petals (called keel), overlap the biggest petal (called standard).

Complete Answer:
A characteristic of the family Fabaceae is vexillary or descending imbricate aestivation. In it, two lateral petals (wings), which in turn overlap two anterior petals (keel), overlap the posterior largest petal (standard). It is also called the corolla of papilionacea.Aestivation or estivation until it has opened in the positional arrangement of the sections of a flower inside a floral bud. Aestivation is most sometimes referred to as prefoliation or prefoliation, although these terms can also mean vernation: the arrangement of leaves within a vegetative bud. Aestivation may be an effective taxonomic diagnosis; except for the genera Fremontodendron and Chiranthodendron, for instance, Malvaceae flower buds have valve sepals, which have often been misplaced as a result.The language used to describe aestivation is similar to that used to describe leaf vernation. Groups of Aestivation include: imbricate-overlapping contorted or twisted-each petal or sepal is on one margin outside its neighbour, and cochleate-spirally twisted contortiply-contorted and also plicate quincuncial-with five parts on the other margin inside its neighbour, where two petals or sepals are outside all others, two inside all others, and the fifth outside on one. Numerous freshwater and marine molluscs have a shell composed of two hinged valves connected by a ligament, like clams, mussels, oysters, and scallops.

Hence the correct answer is option ‘A’.

Note: Corolla vexillary aestivation is a trait of the family Papilionaceae in which papilionaceous corolla (petals) are present. The posterior petal called vexillum is greatest in papilionaceous corolla, two lateral, curved petals are called wings, and two anterior, boat-shaped petals are called keels.