Pumpkin (Cucurbita pepo) pollen grains,scanning electron micrograph (SEM). Pollen grains are reproductive structures produced by the male parts of flowering plants. The grain has a spiked outer wall (exine),which may assist in its dispersal by improving its adherence to pollinating insects | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Oeggerli, Martin |
Bildgröße: | 4825 px × 3619 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |