Question

Tetradynamous stamens and cruciform corolla are characteristic features of
A. Solanum
B. Abelmoschus esculentus
C. Ochroma lagopus
D. Brassica campestris

Answer 1

Hint: Some flowers have six stamens and four loose open petals. They are crossly arranged and look beautiful. They are found in flowers like that of radish. Corolla is the sum of all the petals in a flower.

Complete answer:
Firstly, what are tetradynamous stamens? When the flower has 6 stamens, two shorter than the other four, it is a tetradynamous stamen condition. The four inner stamens are longer than the outer two.
What is cruciform corolla? When four petals are equal and are arranged in a cross, that is called a cruciform corolla. It is a specific feature of family Brassicaceae.
Let us learn about all the options.
Option A. Solanum: In the Solanaceae, the sepals and petals are connate, stamens are epipetalous. The ovary is superior.
Option B. Abelmoschus esculentus: It is the scientific name of Okra, the vegetable we eat. It belongs to Malvaceae. They are pedicellate, pentamerous and hypogynous. They have 5 petals, stamens are monadelphous and epipetalous.
Option C. Ochroma lagopus: It belongs to the family Malvaceae. They are capable of self-fertilization. It is commonly called the balsa tree. It has 5 petals and is epipetalous. Stamens are monadelphous.
Option D. Brassica campestris: It is an economically important plant belonging to the family Brassicaceae. The flowers are actinomorphic, bisexual. They have 4 sepals and 6 stamens (tetradynamous). The ovary is superior.

So the answer is option D: Brassica campestris.

Note: Floral diagram is a graphical representation to understand the presentation and arrangement of a flower. The placement and number of sepals, petals, the stamen is represented through this diagram. The placement of the ovary whether superior or inferior can be learnt. There are different symbols for each part. They can help to understand the angiosperm evolution.