Question

Tetradynamous condition is characteristic of family
A. Papilionaceae/ Pea
B. Cruciferae/ Mustard/ Brassicaceae
C. Solanaceae/ Tomato
D. Malvaceae/ Cotton

Answer 1

It includes many vegetable and oilseed crops. It is characterised by the presence of four petals and sepals, and six stamens. The seeds are typically enclosed in a pod.

Complete answer:
The flower is the reproduction part of the plant. It can be classified according to the location or number of the stamens and the petals, the position of the calyx, the corolla and the androecium, and so on. When the stamens are bound to the petals, they are called epipetalous. When stamens are bound to the perianth, they are referred to as epiphyllous. Flowers can also be categorised on the basis of stamen fusion. In the polyandrous type, the stamens remain free. The stamens are joined into one bundle in a monadelphous flower. In Diadelphous flowers, the stamens are divided into two bundles. A flower is said to be polyadelphous if the stamens are joined together into more than two bundles.

In Papilionaceae / Pea, the stamens are 10 or sometimes 9 and are diadelphous or monadelphous. The posterior stamen is free and nine filaments are fused to form a sheath around the ovary.
The flowers of the family of mustards typically have four petals, four sepals and six stamens. The four inner stamens are longer than the two outer stamens. The stamens are then collectively defined as tetradynamous.
In Solanaceae / Tomato, the stamens are fused into a tube-shaped form. t That is, they are epipetalous and they are polyandrous.
In Malvaceae / Cotton, the stamens are monadelphous. The filaments of both stamens are joined together creating a single ring, but the anthers are separate.

Thus, the correct answer is option B i.e., Cruciferae/ Mustard/ Brassicaceae.

Note: Mustard has two carpels that are fused together. Brassicaceae species are distinguished by four-petalled cross-shaped flowers that have four long and two short stamens and bear pod-like fruits known as siliques.