CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Hazel pollen grains, scanning electron micrograph (SEM). Hazel pollen is distributed by the wind from catkins. The pollen is very small and light, enabling it to be carried long distances on the breeze. It can cause allergic reactions, including hay fever. Pollen grains are reproductive structures produced by the male parts of flowering plants.
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