Which of the following options is associated with the stamen?

The correct answer is Option (2) → Anther, filament, microsporangium, pollen grains

The stamen is the male reproductive organ of the flower. It has a long, slender stalk, the filament, and a bilobed top, the anther. The anther has four microsporangia, which develop into pollen sacs filled with pollen grains. The ovule, style, ovary and stigma belong to the pistil, the female part.

Option (1) Ovule, microsporangium, filament, anthers — Incorrect. Filament, anther and microsporangium are parts of the stamen, but the ovule lies inside the ovary of the pistil. One female part is enough to make this set wrong.

Option (2) Anther, filament, microsporangium, pollen grains — Correct. All four belong to the stamen: the anther and filament are its two parts, the microsporangia lie in the anther, and the pollen grains develop inside them.

Option (3) Ovule, microsporangium, style, ovary — Incorrect. Only the microsporangium is a stamen part here. The ovule, style and ovary are all parts of the pistil.

Option (4) Ovule, pollen sacs, filament, stigma — Incorrect. Pollen sacs and the filament belong to the stamen, but the ovule and stigma belong to the pistil.

NCERT Extract:
Stamen, Microsporangium and Pollen Grain – “Figure 1.2a shows the two parts of a typical stamen – the long and slender stalk called the filament, and the terminal generally bilobed structure called the anther. The proximal end of the filament is attached to the thalamus or the petal of the flower. … The anther is a four-sided (tetragonal) structure consisting of four microsporangia located at the corners, two in each lobe. The microsporangia develop further and become pollen sacs. They extend longitudinally all through the length of an anther and are packed with pollen grains.”