Question

The technical term used for the androecium in a flower of China rose (Hibiscus rosa-sinensis) is
(a)Polyadelphous
(b)Monadelphous
(c)Diadelphous
(d)Polyandrous

Answer 1

Hint: Different androecium structure in plants is described by various terms to understand the cohesion among stamens or between stamen and other parts of the flower. China rose (Hibiscus rosa-sinensis) is an angiosperm and a member of the family Malvaceae of the cotton family or the mallow family. They are dicotyledonous plants.

Complete answer:
The technical term used for the androecium in a flower of China rose (Hibiscus rosa-sinensis) is monadelphous. Monadelphous is the term used to describe the cohesion wherein all the filaments of the anther are united into a single bundle but the anther remains free. By this fusion, a staminal tube is formed that surrounds the gynoecium.

Additional Information: - When the floral parts of similar whorls are fused or united, the condition is called cohesion. When stamens are united by their filaments only then it is termed as adelphi.
- When stamens are attached to other parts of the flower, it is called adhesion. It may be epipetalous (stamens attached to petals), epiphyllous (stamens attached to tepals) and gynandrous (complete stamens or only anthers attached to the gynoecium)
- Malvaceae family consists of most of the economically important fiber yielding plants like food- Ladyfinger (Abelmoschus esculentes), oils- cotton seeds (Gossypium seeds), timber- Balsa wood, lightest wood (Ochroma lagopus), and medicine- (Urena repanda) whose roots are useful in hydrophobia.
So, the correct answer is `monadelphous`.

Note: When stamens of an androecium are free from one another then it is called polyandrous condition. Polyadelphous is the condition in which filaments are united into more than two bundles as in the case of Citrus. Diadelphous is the condition in which filaments of the anther are united into two bundles but the anthers remain free as in the case of a pea.