Presentación alvaro

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reproducción de plantas

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Presentación alvaro

  1. 1. José Rodríguez José Benedicto Pablo Martínez Daniel Plano Juan Pablo Álvaro Cánovas
  2. 2. Flowers are the sexual ogans of flowering plants Most flowers have got four main parts petal sepal Pistil Stamen
  3. 3. petal The petals look like brightly coloured leaves All the petals together form the corolla They protect the inner parts of the flower
  4. 4. Sepal The sepals are small green leaves that grow at the base of the flower All the sepals together form the calyx
  5. 5. Pistil The pistil is the plant’s female reproductive organ It’s got three main parts Stigma Style Ovary Ovules
  6. 6. Stamen Are the plant’s male reproductive organs Each stamen has got a tube collect a filament and a sac called an anther Each anther contains many grains of pollen
  7. 7. For a flowering plant to reproduce the stigma must receive pollen from an anthen
  8. 8. The movement of pollen grains fron the anther to the sitgma is called pollination When a bee lands on a flower, some pollen sticks to the bee’s body. The bee carries this pollen to other flowers and pollinates them. This exchange of pollen between diferent flowers is called cross-pollination
  9. 9. The wind can also carry pollen from one flower to another
  10. 10. FRUIT AND SEEDS When grains of pollen reach the stigma, they combine with ovules to form a seed The union of pollen with an ovule is called fertilization
  11. 11. After fertlization. the flower loses its petals. The fertilized ovules become seeds and the ovary grows until it become a fruit The ovules are fertilized The ovary grows larger The fruit protects the seeds
  12. 12. When the fruit is ripe, it falls from the plant. If the fruit falls in a place with light ,water and good soil ,the seeds can grow and become new plants Germination takes place when a seed begins to grow into a new plant

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