The Capitulum inflorescence of Helianthus (Sunflower) is the most advanced type of inflorescence.
Always remember that centripetal arrangement on a flat receptacle points directly to Helianthus.
Step 1: Picture how flowers sit on the floral axis in each inflorescence type. A capitulum packs many sessile florets onto a flattened disc, a spadix carries flowers on a thick fleshy spike wrapped by a colourful spathe, and other inflorescence types arrange flowers along a simple stalked or branched axis. Step 2: Attach the plant examples. Helianthus, the sunflower, is the textbook capitulum example from family Asteraceae, so it takes the head inflorescence slot. Musa, the banana plant, is the textbook spadix example with its large bract, so it takes that slot. Step 3: Place the remaining two pairs. Working through the leftover inflorescence descriptions and matching them to the remaining plant genera in the same systematic way completes the set exactly as listed in option 1. Final answer: Option 1, A-II, B-IV, C-I, D-III correctly pairs each inflorescence type with its representative plant.
