False colour scanning electron micrograph showing the germination of two pollen grains on the surface of the stigma (pink) from the flower of goosegrass or cleavers,Galium aparine. The pollen grains,which contain the male gametes,are transferred to the flower by insects. A pollen tube is seen growing out of one of these grains (foreground); this will travel through the stigma towards the ovary. The male nuclei travel down this tube,fertilize the ovules and a seed is formed. Magnification: x1100 at 6.45cm size | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 2843 px × 3543 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |