All the anthers are united but the filaments are fused describes which term?

• A. Syngenesious
• B. Asteraceae
• C. Diadelphous
• D. Syncarpous

Answer: (A)

Stamen arrangement hinges on whether the parts are fused by the anthers or by the filaments. When all the anthers are united into a common group, the term used is syngenesious. This describes a situation where the anthers are connate (fused together) to form a single unit, which is a hallmark often seen in many composite flowers where the filaments may remain separate. The other terms refer to different things: asteraceae is just a plant family name, not a description of stamen fusion; diadelphous means the filaments are organized into two fused groups, not that the anthers are fused; syncarpous describes carpels fused to form a single pistil, which is about the ovary, not the stamens. So the description fits syngenesious best.