Daisy pollen (Helianthus sp.), SEM

Numéro d’image : 12301545
Daisy pollen (Helianthus sp.), SEM
Sunflower pollen (Helianthus sp), coloured scanning electron micrograph (SEM). The outer wall (exine) has many small spiky projections. The pollen gets caught in the body hairs of insects visiting the flower. Cross pollination occurs when insects fly to another similar flower and pollen is left behind. Pollen contains the male reproductive cells of a plant. When the pollen grain, containing the male gametes, lands on the stigma of a flower, it germinates. A pollen tube grows out from the germinal pore, down through the stigma, to the ovary. The male nuclei pass down the tube, fertilize the ovules and seed is formed. Humans can also be allergic to daisy pollen. Magnification: x260 when shortest axis printed at 25 millimetres.
Licence : Droits gérés
Crédit: Science Photo Library / DENNIS KUNKEL MICROSCOPY
Taille de l’image : 2725 px × 3206 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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