Pollination and fertilisation in flowers GCSE

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A presentation about the pollination and fertilisation processes that take place in a flower.

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Pollination and fertilisation in flowers GCSE

  1. 1. Reproduction in Flowering Plants
  2. 2. Flower • Sexual reproductive structure • Produces egg and sperm • Fertilization takes place inside the flower
  3. 3. 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 male nuclei enclosed by pollen grains. *Filament – holds the anther up Female reproductiv e organ Male reproducti ve organ
  4. 4. Pollination Self-pollination • Pollen from the anther is transferred to the stigma
  5. 5. Cross Pollination • Pollen from the anther of one plant is transferred to the the stigma of a different plant
  6. 6. • When a pollen grain lands on the stigma, it germinates and a pollen tube grows down through the style to an ovule (egg)
  7. 7. • The ovary and fertilized ovule develop and ripen. *The ovule forms the seed and the ovary forms the fruit. • A fruit is a ripened ovary
  8. 8. The plant embryo uses food stored in the cotyledon of the seed until it develops leaves for photosynthesis
  9. 9. Wind/Insect Pollination
  10. 10. Feature Reason small petals, often brown or dull green no need to attract insects no scent no need to attract insects no nectar no need to attract insects pollen produced in great quantities because most does not reach another flower pollen very light and smooth so it can be blown in the wind anthers loosely attached and dangle out to release pollen into the wind stigma hangs outside the flower to catch the drifting pollen stigma feathery or net like to catch the drifting pollen Wind Pollinated Flowers
  11. 11. Feature Reason large, brightly coloured petals to attract insects often sweetly scented to attract insects usually contain nectar to attract insects moderate quantity of pollen less wastage than with wind pollination pollen often sticky or spiky to stick to insects anthers firm and inside flower to brush against insects stigma inside the flower so that the insect brushes against it stigma has sticky coating pollen sticks to it Insect Pollinated Flowers

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