Identify the correct option with respect to the angiosperm anther:

The correct answer is Option (3) → It is bilobed and dithecus

Option (1) It is bilobed and tetrathecus — Incorrect. The anther has two theca in each lobe (dithecous), not four theca per lobe.

Option (2) It is a tetragonal structure with two microsporangia — Incorrect. An anther is a four-sided (tetragonal) structure, but it has four microsporangia, two in each lobe, not two.

Option (3) It is bilobed and dithecus — Correct. A typical angiosperm anther is bilobed, and each lobe has two thecae, so it is dithecous. It has four microsporangia in all, two in each lobe.

Option (4) It is bilobed with two microsporangia — Incorrect. The anther is bilobed, but each lobe has two microsporangia, so there are four in all, not two.

NCERT Extract:
Stamen, Microsporangium and Pollen Grain – “… A typical angiosperm anther is bilobed with each lobe having two theca, i.e., they are dithecous (Figure 1.2b). Often a longitudinal groove runs lengthwise separating the theca. Let us understand the various types of tissues and their organisation in the transverse section of an anther (Figure 1.3a). The bilobed nature of an anther is very distinct in the transverse section of the anther. The anther is a four-sided (tetragonal) structure consisting of four microsporangia located at the corners, two in each lobe.”