Anther is typically

(a) Tetrasporangiate

(b) Bisporangiate

(c) Trisporangiate

(d) Monosporangiate

The male reproductive organ of a plant is the stamen, which consists of two main parts: a long, slender stalk called the filament and a terminal, usually bilobed structure called the anther.

The anther is four-sided (tetrasporangiate), containing four locules, each with one microsporangium, which develops into pollen sacs. The pollen grains formed in these sacs enter the ovary of the gynoecium and facilitate sexual reproduction in plants. In flowering plants, pollen grains represent a reduced haploid male gametophyte, usually consisting of two or three cells when released from the anther.

Additional details about stamens:

• The filament supports the anther, while the anther is a knob-like structure with two lobes connected by a connective.
• If an anther has one kidney-shaped lobe, it is monoecious; if it has two lobes, it is bithecous.
• When stamens are free from each other, it is called polyandrous, whereas stamens united with the stigma of the carpel are gynandrous.
• Stamens attached to petals are epipetalous, and when attached to the leaf, they are epiphyllous.
• Stamens shorter than the corolla are inserted, while those exceeding the corolla are exerted.
• When the filament attaches at the base of the anther, it is called basifixed.

Answer: The correct term for an anther with four microsporangia is tetrasporangiate.