Bees pollinate the flowers, but receive no reward. They are attracted to the color and the sweet aroma of the flower. They expect nectar. But when a bee enters the flower pouch through the slit in the front, not only is there no nectar -- it can't back out. To reach an exit, it has to squeeze past the flower's female reproductive structure, the stigma. If the bee has been inside other blossoms, pollen on its body is deposited on the stigma, pollinating it. The bee also has to squeeze past a pollen mass, where it receives a new dusting of pollen to carry to the next flower. Tricky!
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