Insect pollinators are attracted to the aroma emitted from the petals and the nectar glands located inside the flower. When an insect grazes through a flower to collect nectar, pollen grains accumulate on its body from the anther. As the creature maneuvers to each flower, it leaves a residue of pollen on the stigma and triggers the process of pollination. Examples of insect pollinators include honeybees, bumblebees, moths and butterflies.So the answer would be petals