Coloured SEM of mallow pollen grain

Coloured SEM of mallow pollen grain

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Credit: SCOTT CAMAZINE/SCIENCE PHOTO LIBRARY

Caption: Pollen. Coloured scanning electron micrograph (SEM) of a pollen grain of the Mallow plant, Sida megeniana. The grain is spherical and its outer wall (exine) consists of numerous sharp spines. These spines enable the pollen to attach to insects. The pollen is spread to other flowers when the insect visits them to feed. When the pollen, containing the male gametes, is transferr- ed to the stigma (female reproductive part) of another flower, it germinates. A pollen tube grows out from the grain, down through the stigma, to the ovary. The male nuclei pass down the tube, fertilize the ovules and a seed is formed. Magnification: unknown.

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Keywords: botany, mallow, nature, plant, plants, pollen, reproduction, reproductive, sida megeniana, type

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