Question

Characteristic feature of Malvaceae family is
A.Monothecous anthers
B.Didynamous stamens
C.Presence of staminodes
D.Superficial placentation

Answer 1

Hint: The Malvaceae family display anthers with a single lobe and two chambers of pollen. Hibiscus rosa-sinensis refers to the Malvaceae family.

Complete answer:
First we should know about the family Malvaceae to answer this question. Malvaceae is a genus of flowering plants known to have 244 genera with 4225 recognised species. Well-known representatives of economic significance contain okra, cacao, cotton, and durian. Few familiar ornamental genera, such as Alcea, Malva and Lavatera, as well as Tilia, are also found.
Now, let us find the solution from the options-
 The anther of Malvaceae family is said to be monothecous anther because it comprises just one lobe. Bisporangiate anthers are monothecous (containing two sacs of pollen). Monothecous anthers are the distinctive feature of the genus of Malvaceae.
The stamens of Malvaceae family are indefinite, monadelphous and form a staminal tube. Therefore, the option B is incorrect.
Staminodes, on a whorl beyond the stamen whorl, are vestigial stamens that form in antesepalous position. Staminodes are born from the regions between the petals and are fused into the tube of the corolla. In the Malvaceae family, this characteristic is not found. Therefore, the option C is incorrect.
In the Malvaceae family, axile placentation is present where the ovules in each locule are borne at or near the middle of the placenta. Superficial placentation is a type of placentation where the ovules grow all over the inner side of the partition wall. In the Malvaceae family, this characteristic is not found. Thus, the option D is incorrect.

Hence, the correct answer is option (A)

Note: The large spherical, spiny and along with monothecous anthers, pollen grains constitute one of the distinguishing characters of the family. The multiplication of five epipetal members is believed to have produced several stamens.