Question

What is meant by monadelphous stamen?

Answer 1

Hint: The male reproductive organ of the flower is known as the stamen. In the angiosperm flower, it is composed of a filament (i.e. stalk) and anther sacs (pollen is produced here). Anther comprises the microsporangium. Many blossoms possess stamens that are altered to introduce the pollen in a unique manner to suit insect pollinators.

Complete answer:
The term "adelphous" is used when we describe the fusion of filaments. Adelphous is a Greek word, which means brother or male relative. Stamens may be fused by their anther, filament, or both. The condition in which all the filaments of stamen are fused to form a single hollow tube but anthers stay free, in the androecium is known as monadelphous. This condition is found in the members of the family Malvaceae and Oxalidaceae. Monadelphous stamens are when the stamens are fused to form a variety of tunes. When all the filaments of a stamen are fused in two groups, such a condition is known as diadelphous. For example, members of genera Fabaceae, such as Astragalus (in which 9 filaments are fused and one is separate). If the filaments were fused in greater than 2 groups, then such condition is known as Polyadelphous. This condition is found in Hypericaceae, Rutaceae, and Myrtaceae.

Note:
Monadelphous stamen is found in those angiosperms flowers that possess a large central column and have many anther sacs. Each stamen in the flower of angiosperm is united by their stalk-like structure known as filaments to form a staminal tube. The style enacts through the staminal tube and arises out of it to bear stigmas. The top of the filaments is free and carries the anthers.