Question

Tetradynamous condition of the androecium is a characteristic feature of the family
A. Brassicaceae
B. Fabaceae
C. Poaceae
D. Malvaceae

Answer 1

Hint:- Tetradynamous conditions occur when a plant bears six stamen out of which four are long and two are short. Short stamens are present in outer whorl while long stamens are present in inner whorl. Androecium having tetradynamous condition is called tetradynamous androecium. Androecium indicates the presence of male reproductive unit.

Complete step-by-step solution:-
Flower is made up of reproductive and non- reproductive structure arranged in four whorls. These consist of calyx, corolla, androecium and gynoecium. Androecium refers to the male reproductive unit stamen, mainly composed of filament and anther. Tetradynamous condition is generally found in the androecium of Cruciferae or also called Brassicaceae. Brassicaceae family is commonly known as mustard family. Important flowers of family brassicaceae are Brassica campestris, Brassica oleracea, Brassica rapa etc. Distinctive features of family are-
I. Flower tetramerous
II. Cruciform corolla
III. Tetradynamous condition
IV. Bicarpellary, syncarpous, superior ovary, stigma bifid.
V. Fruit is silicula.
Family Fabaceae has diadelphous androecium. Stamens are 9 to 10 in numbers. In Malvaceae, there is a monadelphous stamen. Keeping these features in mind we can clearly say that tetradynamous condition of androecium is commonly found in brassicaceae. So the correct option is A.

Note:- Brassicaceae species has two carpels and a total six number of stamen, two outer are opposite to lateral sepals and four inner are opposite to petals. Four stamens have longer filament as compared to the other two outer stamens. It has a unilocular ovary which becomes bilocular due to false septum or replum.