Aster seed,SEM

Numéro d’image : 11539921
Aster seed,SEM
Aster seed. Coloured scanning electron micrograph (SEM) of a seed from an aster flower (Aster sp.). The structures seen here are the cypsela (lower frame) and a large pappus (upper frame). The pappus aids in wind dispersal. The cypsela is a type of achene,a specialised dry fruit,and the actual seed is inside the cypsela. A seed contains an embryo (a fertilised ovule from which a new plant can grow),and a supply of food. Seed dispersal methods include being carried by the wind,or water or on animal coats,or being eaten and deposited in animal droppings. Aster flowers are mostly native to Eurasia,and are a popular garden plant. Magnification: x420 when printed 10 centimetres tall
Licence : Droits gérés
Crédit: Science Photo Library / Gschmeissner, Steve
Taille de l’image : 2835 px × 3780 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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