com slash science or drop us a line at d w underscore site tech on facebook d.w. dot science. time to turn now to the marriott how his plants rely on for their reproduction are drawn by sense and color pattern interest like bees carry the pollen from one flower to the stigma of another. 75 percent of our crops from pears to pumpkins rely on polonaises to play a role in reproduction in fact of all flowering plants nearly 90 percent make use of the service they provide. the problem now is that insect diversity is under serious threat some crop plants like rice a wheat get by just fine without pollinators but nearly all nutrient heavy fruit and vegetable species actually depend on them so insects are key to ensuring our