Question

How many theca are present in each lobe of a typical bilobed angiosperm anther?

• A. 12
• B. 2
• C. 6
• D. 8

Hint:

• Key Terminology Distinction: itemize

• Number of theca per lobe = \(2\) (dithecous)

• Number of theca per entire typical anther = \(4\) (tetrathecous / tetrasporangiate)
A distinct longitudinal groove runs along the outer surface of each anther lobe, marking the internal division between the two corresponding theca. itemize

Answer 1

The Correct Option is B

Step 1: Read the question carefully.
We need the number of theca present in EACH lobe of a typical bilobed angiosperm anther.
Step 2: Recall the anther structure.
A typical anther is bilobed, meaning it has two lobes joined by a sterile connective tissue.
Step 3: Look inside one lobe.
Each lobe is divided into two chambers called theca, so each lobe is described as dithecous.
Step 4: Count for the whole anther.
Two lobes with two theca each give four pollen sacs in total, so the whole anther is tetrasporangiate.
Step 5: Focus on the per-lobe count.
The question asks per lobe, not the whole anther. Since each lobe is dithecous, it has exactly $2$ theca.
Step 6: Conclude.
So each lobe has $2$ theca, which is option (2). Be careful not to pick the total of $4$.
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