Whiplash pollination by the honey bee (Apis mellifera) of a Scotch broom flower (Cytisus scoparia). In pressing down to suck nectar from the flower, the bee triggers the plant's style and stamens to spring out, dropping grains of pollen on the bee's abdomen. Each pollen grain contains a male gamete which, when deposited on another plant of the same species, can fertilise an ovule and produce seeds.