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- some vector carry pollen from the anther of male to the stigma of female

- the pollen grain contains 2 nuclei - the tube nucleus and the generative nucleus. The generative nucleus later becomes 2 sperm nuclei

- the tube nucleus digests a tube down through the style to a small opening called the micropyle

-the two sperm nuclei then enter the ovary:

~ one fertilizes the egg -- seed (2n)

~ the other sperm nucleus fertilized 2 polar bodies to create the endosperm -- (3n)

- the endosperm encloses the seed, providing both nourishment and protection

* This process is referred to as double fertilization because 2 sperm are required to fertilize both the egg and the endosperm.

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