Question

Diadelphous stamens occur in
(a) Gramineae
(b) Cucurbitaceae
(c) Papilionaceae
(d) Malvaceae

Answer 1

Hint: This is a condition where filaments remain united while the anthers are free. When the filaments form two bundles in which one bundle contains one stamen, while the other nine stamens together form another bundle, it is called diadelphy (9+1).

Complete answer:
Diadelphous stamens occur in Papilionaceae. It is majorly seen in the largest family under the order leguminates. Let’s learn about stamens and their arrangement to comprehend the answer better.
- The stamens in a flower may either remain free (polyandrous) or may be united with one another to varying degrees.
- When united they may form into one bunch or one bundle (monadelphous) as in china rose, or two bundles (diadelphous) as in pea, or into more than two bundles (polyadelphous) as in citrus.
- There may even be a variation in the length of filaments within a flower, as in Salvia and mustard.
- Stamens of flowers may also be united with other members such as petals or among themselves.
- When stamens are attached to the petals, they are considered as epipetalous as seen in brinjal. - When stamens are attached to the perianth as seen in the flowers of lily, the condition is called epiphyllous.
So, the correct answer is Papilionaceae.

Note:
- Gramineae: The androecium in Gramineae typically consists of three or occasionally 6 distinct stamens (polyandrous).
- Cucurbitaceae shows monadelphous conditions.
- In the family, Malvaceae, and many other flowers the filaments fuse to form a bundle (monadelphous). These united filaments form a staminal tube through which the long style of the pistil passes.