Caption: Animated coloured scanning electron micrograph (SEM) of two types of pollen grains. At the start is shown pollen from a sunflower (Helianthus annuus), before the view pulls back to show the much larger pollen grains of the hollyhock (Althaea rosa). The outer walls (exine) of each pollen grain have a spiky structure, thought to help the grains adhere to their insect pollinators. The pollen is transferred to the stigma of the flower, where it fertilises the ovules in the female ovary to form seeds.

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Keywords: allergy, althaea rosa, botany, cause, coloured, comparison, different, garden hollyhock, helianthus annuus, hollyhock, images, magnified image, microscopic photos, nature, plant, plants, pollen, pollen of, reproduction, reproductive, round shape, rounded circular, scale, sem, size, sizes, subjects, sunflower, type

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Hollyhock and sunflower pollen, SEM

K007/3983 Rights Managed

Downloadable master

Duration: 00:00:15

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 715.7M


Capture format: Digital Rostrum

Frame size: 4175x3454

Codec: JPEG

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