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Reproduction in plants

Science Teacher & Head of Science Department em British City College Zamalek
19 de Mar de 2014
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Reproduction in plants

  1. Reproduction in plants
  2. Sexual & asexual reproduction Sexual reproduction:  Two parents  Fusion of a female & male cells (gametes)  Parent & offspring are not identical  Slower  Variation is present in the same species Asexual reproduction:  One parent only  No gametes are produced  Parent and offspring are identical  Faster  No variation
  3. Examples of asexual reproduction. Budding in yeast Nucleus replicates Nucleus migrates to one end Part of the cell grows into a bud The bud separates creating a new cell
  4. Examples of asexual reproduction. Vegetative reproduction in potato plants
  5. Examples of asexual reproduction. Runners in strawberry
  6. Sexual reproduction in plants  To reproduce sexually plants have male and female reproductive organs in their flowers.  The male part is called the stamen  The female part is called the carpel
  7. POLLINATION It is the transfer of pollen grains from the anthers to the stigma Pollinating agents Insects Wind
  8. Differences between insect & wind pollinated flowers Insect pollinated Wind pollinated  Have large colored petals with guide lines  Have a scent  Have a nectary on which insects feed  Have a sticky stigma for pollen grains to stick on it  The female and male organs are enclosed in the flower  Pollen grains are larger with spikes to hold on insect body  Have small green petals, no guide lines  Have no scent  Have no nectary  Have a feathery stigma to catch the pollen in the air  The female and male organs are hanging outside the flower  Pollen grains are smaller & light weight to be carried by wind
  9. POLLEN GRAINS AS SEEN UNDER THE MICROSCOPE Can you tell which belongs to insect pollinated flowers / wind pollinated flowers?
  10. FERTILISATION It is the joining of male and female cells to produce a zygote. Ovary Fruit Ovary wall Fruit cover Ovule Seed
  11. Seed structure D
  12. Seed-fruit dispersal  If a seed lands next to the parent plant and germinates it will compete with the parent plant for nutrients in the soil.  Most plants developed methods to scatter/disperse their seeds to ensure they land further away from the original plant.  There are 2 main methods of seed dispersal:  Wind dispersal  Animal dispersal
  13. Wind dispersal Parachute e.g. dandelion Winged fruits e.g. Acer
  14. Animal dispersal Hooked fruits e.g. Burdock and others
  15. Animal dispersal  Other fruits are large coloured and fleshy/juicy to attract animals to eat them, swallowing the seeds at the same time.  The seeds have hard indigestible testa that pass out with faeces in a new area away from original plant.  Example of such fruits: apple, acorn, strawberries…etc.
  16. Seed germination  Once a seed falls onto a suitable surface it starts to grow.  Conditions required for seed germination: 1. Suitable temperature 2. Oxygen 3. Water
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