Step 1: Recall entomophily traits:
Flowers pollinated by insects (entomophily) are typically large, colourful, fragrant, and produce nectar to attract the pollinator.
Step 2: Contrast with anemophily:
Light, small, non-sticky pollen in huge numbers are wind-pollination (anemophily) traits, not insect-pollination traits.
Final Answer:
A coloured, attractive corolla is the insect-pollination adaptation.