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. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / EYE OF SCIENCE |
Taille de l’image : | 6400 px × 5275 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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