angiorepro213-page19

angiorepro213-page19 - cotyledons, which then become

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Flowering Plant Reproduction - 19 Fertilization In contrast to other living organisms, flowering plants require two sperm for successful reproduction. 1 Sperm + Egg ---> Zygote ---> Embryo Development 1 Sperm + 2 Polar nuclei (of the embryo sac) ---> Endosperm nucleus (Triploid or 3n) ---> endosperm tissue The function of the endosperm is to provide a source of nutrients and growth promoting hormones for the developing embryo within the embryo sac. Any endosperm remaining at maturity may be used for germination and seedling establishment. Endosperm may be absorbed by part of the embryo, the
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Unformatted text preview: cotyledons, which then become "fleshy", to provide nutrients for germination and seedling establishment as well. Legumes are a group of angiosperms that have fleshy cotyledons. Endosperm is often starchy, but may contain oils and proteins as well. Coconut milk is an example of a liquid endosperm. Following fertilization, the zygote develops into the embryo, the endosperm nucleus into the endosperm tissue, the embryo sac wall and integuments of the ovule into the seed coat and the ovary and accessory tissue into the fruit....
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