Coloured scanning electron micrograph (SEM) of ragweed (Ambrosia sp.) pollen grains sprouting pollen tubes on the pistil (female part) of a flower. The tubes burrow through the pistil to the ovaries, carrying the male sex cells to them for fertilisation. Magnification: x2,000 when printed at 15cm wide. (KEYSTONE/SCIENCE PHOTO LIBRARY/EYE OF SCIENCE/SCIENCE PHOTO LIBRARY)
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