Question

Explain with suitable examples the different types of aestivation

Answer 1

Aestivation is the mode of arrangement of sepals or petals in a floral bud with respect to the other members of the same whorl.

There are four main types of aestivation.

They are as follows:

1. Valvate aestivation:
Example - The corolla of Brassica.

2. Twisted aestivation:
Example - Corolla or corollate of the China Rose or hibiscus rosasinesis.

3. Imbricate aestivation:

4. Vexillary aestivation:

Answer 2

Answer:-

★ Aestivation:-

→ The mode of arrangement of sepals and petals in floral bud is called aestivation.

★ Types of aestivation:-

There are 4 types of aestivation, they are:-

→ Valvate:- Here, sepals or petals in a whorl just touch one another at the margin, without overlapping.

Example:- Calotropis.

→ Twisted:- Here, one margin of the appendage overlaps that of the next one and so on.

Example:- China rose

→ Imbricate:- Here, the margins of sepals or petals overlap one another but not in any particular direction.

Example:- Cassia

→ Vexillary:- In pea & bean flowers, there are five petals. The largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel). This type of aestivation is known as vexillary.

Example:- Pea