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How many theca are present in each lobe of a typical bilobed angiosperm anther?
Dithecous = "Di" (Two) Theca per lobe!
A typical angiosperm anther is a bilobed structure with each lobe having two theca (chambers), making it dithecous. Often a longitudinal groove runs lengthwise separating the two theca.
The question specifically asks: "How many theca are present in each lobe?". In each lobe, there are 2 theca. Across both lobes combined, the whole anther contains 4 theca / 4 microsporangia.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
100% scientifically accurate. Each anther lobe is dithecous, meaning it contains exactly two theca.
Incorrect. Four is the total number of theca/microsporangia in the ENTIRE bilobed anther, not in each individual lobe.
Incorrect. An anther lobe with one theca is monothecous, which is an exception found in family Malvaceae (e.g., Hibiscus), not typical angiosperms.
Incorrect. No normal angiosperm anther lobe possesses three theca.
The word "each lobe" is the key discriminator. Students reading hurriedly see "tetrasporangiate = 4" and immediately bubble 4, forgetting that 4 theca are distributed across 2 lobes (2 per lobe).
"A typical angiosperm anther is bilobed with each lobe having two theca, i.e., they are dithecous."
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