Some flowering plant species, entirely dependent on bees for pollination, lure their pollinators with abundant nectar and pollen, which are the only source of food for bees  Often the pollinating species is so highly adapted that it can feed from -- and thus pollinate -- only a single species of plant  Similarly, some plant species have evolved flowers that only a single species of bee can pollinate -- an arrangement that places the plant species at great risk of extinction
If careless applications of pesticides destroy the pollinating bee species, the plant species itself can no longer reproduce
The total destruction of the habitat of some plant species could cause some bee species to become extinct.