Question

The arrangement of floral whorls on the thalamus from the outermost to the innermost is:
A. Calyx, corolla, androecium and gynoecium
B. Calyx, corolla, gynoecium and androecium
C. Gynoecium, androecium, corolla and calyx
D. Androecium, gynoecium, corolla and calyx

Answer 1

Hint: Angiosperms are flower-producing plants. The reproductive organ of plants is the flower. The vegetative (which comprises the petals and calyx) and reproductive (which includes the stamen and pistil) parts of a flower are the same.

Step by step solution:
 It is believed that the flower is a modified stalk. The four main components of a typical flower are the calyx, corolla, androecium, and gynoecium.

• • Calyx: It is the flower's outermost whorl. The calyx is made up of several sepals, each of which is referred to as a separate unit of the calyx. Sepals have a structure that resembles a little leaf. When in bud condition, the calyx serves as protection in the inner floral whorls.

• Corolla: Flowers are lovely and alluring because of their petals. A corolla is made up of several petals, each of which is referred to as a petal. The colour of petals is determined by the anthocyanin pigment. The primary purpose of the petal is to draw insects, which aid in pollination. Bright colours draw the insect's attention.

• Androecium: Androecium refers to the flower's male reproductive whorl. The stamen is one instance of an androecium. An anther, a connective, and a filament make form a stamen. The fertile portion of an anther is where pollen or microspore grains are made. Microsporogenesis is the process through which microspores form.

• Gynoecium: The female reproductive component of the flower is called the gynoecium or carpel. The term "pistil" can be used to describe the gynoecium. It is made up of three parts: the stigma, the style, and the ovary. Ovules or eggs are produced by the ovary. The basal swelling region of the carpel is the ovary. Megasporangia is another name for an ovary.

Therefore, the calyx is the outermost whorl whereas the gynoecium is the innermost.

So, option A is correct.

Note: The flower's accessory whorls are the calyx and the corolla. The flower's stamen and carpel are required or necessary whorls. The ovary develops into a fruit, and the ovules develop into seeds.