Question

Correct position of the floral parts over the thalamus in the mustard plant is:

• A. Gynoecium occupies the highest position, while the other parts are situated below it
• B. Margin of the thalamus grows upward, enclosing the ovary completely, and other parts arise below the ovary
• C. Gynoecium is present in the centre and other parts cover it partially
• D. Gynoecium is situated in the centre, and other parts of the flower are located at the rim of the thalamus, at the same level

Answer 1

The correct option is A Gynoecium occupies the highest position, while the other parts are situated below it

Based on the position of the gynoecium with respect to other floral parts (calyx, corolla and androecium), flowers are of three types:

• In hypogynous flowers, ovary will be superior, gynoecium occupies the highest position and other floral parts are situated below it. Example: Mustard.

Hence option a is correct.

• In perigynous flowers, the gynoecium is located in the centre and other floral parts are located at the rim of the thalamus almost at the same level. Ovary will be half inferior in such flowers. Example: Plum, rose

• In epigynous flowers, ovary will be inferior. The margin of the thalamus grows upward and encloses the ovary completely and gets fused with it. The other parts of the flower arise above the ovary in an epigynous flower. Example: Cucumber