Pollen grain. Coloured scanning electron micrograph (SEM) of a pollen grain from a marrow plant (Cucurbita sp.). This is among the largest of any plan

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Pollen grain. Coloured scanning electron micrograph (SEM) of a pollen grain from a marrow plant (Cucurbita sp.). This is among the largest of any plant pollen. There is great variation in the size, shape and surface texture of pollen. The outer wall (exine) is highly sculpted in many plants, which may assist in dispersal. Each pollen grain contains a male gamete, which fertilises the eggs or ovules, initiating the formation of plant seeds. Magnification: x353 at 6x7cm size.

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Size: 3000px × 3500px
Photo credit: © POWER AND SYRED/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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