Question

Monothecous anthers occur in
A. Hibiscus rosa-sinensis, Malvaceae
B. Allium cepa, Liliaceae
C. Brassica oleracea, Cruciferae
D. Solanum nigrum, Solanaceae

Answer 1

Hint: Androecium is the male reproductive part of the flower. An androecium is a group of the stamen. Monothecous anther is anther with a single lobe. The presence of Monothecous anther is a character of the Malvaceae family.

Complete answer:
Stamen is made up of anther, connective and filament. If anther is single lobed with two pollen sacs in it is called a monothecous anther. If anther is bi-lobed it is called the dithecous anther. It has four pollen sacs so it is called a tetrad. Every family of angiosperms has unique characters. The presence of monothecous anther is the character of the Malvaceae family. The presence of dithecous anther is the character of Liliaceae, Cruciferae, Solanaceae. Hibiscus rosa-sinensis commonly called china rose is a member of the Malvaceae family and thus, shows the presence of monothecous anther.

So, the correct answer to the given question is option A, i.e., Hibiscus rosa-sinensis, Malvaceae.

Additional information:
Some other characters of the Malvaceae family-
-Presence of Solitary axillary inflorescence.
-Have the presence of bracts.
-Presence of epicalyx.
-Complete, actinomorphic, hypogynous, and pentamerous flower.
-Members have five petals hence called polypetalous.

Note: Angiosperms are flower-bearing plants. The male reproductive part of the flower is called androecium and the female reproductive part is called gynoecium. The presence of monothecous anther is the character of the Malvaceae family. Monothecous anther has two pollen chambers whereas, families like Liliaceae, Cruciferae, Solanaceae show the presence of four pollen chambers i.e. dithecous anther.