Question

Tetradynamous stamens and cruciform corolla are characteristic features of
(a) Solanum tuberosum
(b) Abelmoschus esculentus
(c) Ochroma lagopus
(d) Brassica campestris

Answer 1

Hint: The characteristics of the species in the family Brassicaceae are tetradynamous stamens and cruciform corolla. It is an essential genus that includes vegetables including broccoli, cauliflower, sprouts of Brussels, and turnips. In this family, there are radishes too.

Complete answer:
The family of Brassicaceae is characterized by tetradynamous stamens, a cruciform corolla, and fruits called silique or silica.
Four free petals forming a cruciform corolla (arranged in the shape of a cross) have Brassica campestris flowers.

Tetradynamous is an androecium condition in which six stamens are present, four of which are longer and are inserted into the inner whorl and two are smaller and inserted into the outer whorl.
A type of corolla containing four free petals arranged in the form of a cross is the cruciform corolla.
Brassicaceae characters:
Actinomorphic, often zygomorphic, hermaphrodite flowers. Here, four sepals in two whorls of two each, four petals, diagonally arranged-cruciform are present. They have six stamens, tetradynamous; bicarpellary, syncarpous, parietal, bilocular gynoecium, due to the formation of the false septum (replum) ; fruit siliqua or silicula.
Calyx:
Sepals 4 arranged in two whorls of two each, polysepalous (2 anteroposterior and 2 lateral), saccate, imbricate aestivation, inferior, maybe 2 lateral sepals.
Corollas:
Petals 4, polypetalous, alternate with sepals, petals arranged in the shape of a cross known as the cruciform. This arrangement is characteristic of the typically clawed family petals, typically equally but rarely unequal petals, or sometimes stamens may replace petals.

Additional information: The flower of Solanum tuberosum comprises five fused petals that form a corolla in the infundibulum form.
Abelmoschus esculentus belongs to the Malvaceae family, along with Ochroma lagopus. Both contain five petals that are free.
So, the correct answer is, ‘Brassica campestris’.

Note: Brassica is a plant genus in the family of mustards (Brassicaceae). Cruciferous vegetables, cabbages, or mustard plants are informally known as members of the genus. Crops from this genus are often referred to as cole plants, derived from the Latin caulis, denoting a plant's stem or stalk.
Brassica campestris, an important oilseed crop dependent on pollinators from tropical and temperate regions, is often grown in the Himalayan hills in a mixed cropping system.