Which floral condition describes stamens whose filaments are united into a single bundle or tube surrounding the style, as observed in China rose (Hibiscus rosa-sinensis)?
Answer and explanation
Correct answer: D. Monadelphous androecium
- Step 1: Cohesion of stamens refers to the fusion between stamens within the androecium.
- Step 2: When filaments are united into a single continuous tube while anthers remain free, the condition is termed monadelphous (e.g., China rose and Malvaceae).
- Step 3: In diadelphous condition, filaments unite into two distinct bundles (e.g., pea, 9+1); in polyadelphous, they unite into several bundles (e.g., Citrus).
Answer
Monadelphous androecium
Why not the others: 'Diadelphous androecium' has filaments fused into two groups; 'Polyadelphous androecium' has filaments fused into three or more clusters; 'Syngenesious androecium' has anthers fused together while filaments remain free (e.g., sunflower).
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