Multiple choice

Diadelphous androecium is that in which

  1. stamens are arranged in two groups

  2. stamens are fused completely and form two groups

  3. fusion occurs in the region of filaments only, which form two groups with varying number of filaments in each group

  4. fusion occurs in the region of filaments only which form two groups with fixed number of filaments in each group

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diadelphous androecium is characterized by stamens whose filaments are fused into two separate bundles (groups), while anthers remain free. The number of filaments in each bundle can vary - in Fabaceae (pea family), the typical arrangement is 9+1 (nine stamens in one bundle, one stamen separate). Option A is incorrect because simply being in two groups is not sufficient - fusion must occur. Option B is incorrect because complete fusion (including anthers) would make it synandrous, not diadelphous. Option D is incorrect because the number of filaments is not fixed - it varies among species.

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