Flowers & pollinating insects evolved together. Flowering plants provide a reward, (usually in the form of nectar) & insects carry pollen from flower to flower.
A problem for the plant is that some of the pollen may be wasted, if the insect next visits a different species of flowering plant.
Some insects & plants are adapted to one another — in South Africa, pink gentian flowers provide pollen as a reward, which they keep locked, & only carpenter bees have the key:
For the plant, the advantage is that it doesn’t have to invest energy in producing nectar, & its pollen is more efficiently transferred to other flowers of its own species. A guaranteed source of food with exclusive access is the reward for the carpenter bee. / wings carpenter bees pink gentian flowers release their pollen beating at a frequency anthers vibrate pink gentian grows Southern Africa pollinated bumble furry carpenter bees flowering flowers gentian spread petals wide curving white style three large stamens long thick anther covered yellow pollen pollen-feeding insect yellow anther hollow pollen held inside tiny hole top of the anther extract bee making high-pitched buzzing noise wings alights anther beating its wings lowers the frequency note buzz approximately middle anther vibrate just the right frequency release pollen grains spout hole at the top yellow fountain evolution evolve adapt adapted /
