Question

Describe the arrangement of floral members in relation to their insertion on thalamus.

Answer 1

Hello!!

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Based on the position of the calyx, corolla, and androecium (with respect to the ovary on the thalamus), the flowers are described as hypognous, perigynous, and epigynous.

In hypogynous flowers, the ovary occupies the highest position on the thalamus while other floral parts are situated below it.

In such flowers, the ovary is superior e.g., China rose, mustard etc.

In perigynous flowers, the ovary is situated at the centre and other floral parts are arranged on the rim of the thalamus.

The ovary here is said to be half inferior e.g., plum, rose, peach.

In epigynous flowers, the thalamus grows around the ovary fusing with its wall.

The other floral parts are present above the ovary.

Hence, the ovary is said to be inferior e.g., flowers of guava and cucumber.

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Thanks!!

Answer 2

The description of the arrangement of the members of floral on the basis of their type of insertion in the thalamus is -

Hypogynous

It is the kind of arrangement where the gynoceium, that is the female part, is present in the highest posture. And the other sections are located in the bottom of it.

Examples : Brinjal and Mustard.

Perigynous

The type of arrangement where the gynoceium is located in the middle portion while other sections of flower are present at the similar level in the thalamus.

Examples : Plum and Peach.

Epigynous

Here, the ovary is enclosed by the thalamus and gets fused with it.

Examples : Guava.