7. reproduction in flowering plants - part 2
TRANSCRIPT
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Reproduction in Flowering Plants
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Flower• Sexual reproductive structure
• Produces egg and sperm
• Fertilization takes place inside the flower
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Pollen is produced in the male organs of the
flowers - anthers. Pollination occurs
when pollen is transferred from the
anthers to the female organs by wind or by animals. If the female
stigma is receptive to a pollen grain, the pollen
produces a pollen tube, which grows through the female tissue to the egg,
where fertilization takes place by the sperm nucleus.
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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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Pollination
• Transfer of mature pollen grains from the anther to the stigma
-wind
-insects
-birds & other animals
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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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Fertilization• 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)
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*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
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The plant embryo uses food stored in the cotyledon of the seed until it develops
leaves for photosynthesis
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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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Parts of a seed
• Dicot
• Monocot
Seed coat
Epicotyl
Cotyledons
Hypocotyl
Seed coatEndosperm
Epicotyl
Hypocotyl
RadicleCotyledon
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Seed Germination
Monocot Dicot
Hypogeous
Epigeous
Radicle
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