Reproduction in Flowering Plants

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Reproduction in Flowering Plants:

Reproduction in Flowering Plants

Flower:

Flower Sexual reproductive structure Produces egg and sperm Fertilization takes place inside the flower

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Pistil *Stigma –top of the pistil, Sticky surface for pollen to stick to *Style – connects the stigma to the ovary *Ovary –contains ovules ( eggs) Stamen *Anther – produces sperm nuclei by meiosis. Sperm nuclei are enclosed by pollen grains. * Filament – holds the anther up Female reproductive organ Male reproductive organ

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Transfer of mature pollen grains from the anther to the stigma -wind -insects -birds & other animals Pollination

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When a pollen grain lands on the stigma , it germinates and a pollen tube grows down through the style to an ovule (egg)

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The sperm travels through the pollen tube to the ovule. The sperm & egg fuse forming the zygote (fertilized egg) –this grows into the plant embryo (cells grow by mitosis) Fertilization

*Self pollination –pollen from same flower *Cross pollination – pollen from a different flower - more variation:

* Self pollination – pollen from same flower * Cross pollination – pollen from a different flower - more variation

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The ovary and zygote (fertilized ovule) develop and ripen. *The ovule forms the seed and the ovary forms the fruit . A fruit is a ripened ovary

The plant embryo uses food stored in the cotyledon of the seed until it develops leaves for photosynthesis:

The plant embryo uses food stored in the cotyledon of the seed until it develops leaves for photosynthesis

micropyle –opening in ovule where pollen tube attached, sperm entered hilum –scar where ovule attached to ovary radicle –embryonic root:

micropyle – opening in ovule where pollen tube attached, sperm entered hilum – scar where ovule attached to ovary radicle – embryonic root Seedling

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Epicotyl – grows above the cotyledons and gives rise to the leaves. Hypocotyl – below the point of attachment of the cotyledon, develops into the stem.

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Dicot Monocot Seed coat Epicotyl Cotyledons Hypocotyl Seed coat Endosperm Epicotyl Hypocotyl Radicle Cotyledon Parts of a seed

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Monocot Dicot Hypogeous Epigeous Radicle Germination

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