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Passage of the pollen tube through the micropyle of an ovule in a seed plant.



the usual route by which a pollen tube enters an ovule—via the micropyle—in the fertilization of angiospermous and gymnospermous plants. When the pollen tube penetrates the ovule by a different route, the process is called aporogamy (for example, penetration of the chalaza is known as chalazogamy).

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