Illustration of petunia flowers

Illustration of petunia flowers

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Caption: Petunia. Illustration showing the flowers of a petunia, Petunia hybriden. One flower is cut away to show the reproductive structures. The long style with its flat-ended stigma is in the centre of the flower, surrounded by shorter pollen- producing stamens (white). When pollen grains, containing the male gametes, land on the ripe stigma, they germinate. Pollen tubes grow from the pollen grains down through the style to the ovary. The male nuclei pass down these tubes, fertilize the ovules and seeds are formed. In petunias an enzyme present in the female structures (stigma, style & ovary) destroys pollen from the same plant, preventing self- pollination.

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Keywords: artwork, botany, cut away, flower, flowering, flowers, nature, petunia, petunia hybriden, plant, plants, reproductive structures, type

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