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Presentation From Lavender


Presentation From Lavender Video on seed dispersal Other methods on dispersal In order to deal with the realities of ... – PowerPoint PPT presentation

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Title: Presentation From Lavender

Presentation From Lavender
Video on seed dispersal
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Other methods on dispersal
  • In order to deal with the realities of dispersal,
    plants have evolved specific structures and
    strategies to carry their seeds throughout the
    environment. Some seeds have two lateral wings to
    help them glide. Dandelions and salsifies use
    umbrella-like parachutes instead. Other seeds are
    known as "helicopters" or "whirlybirds" because
    they have spinning wings.
  • 2. The wind is not the only method for seed
    dispersal. Seeds also can hitch rides on animals,
    preferably winged animals such as insects, bats
    and birds, as they usually travel the greatest
    distances. Other methods include travel by water
    and "ballistics" that fling seeds away from the
    plant at great speeds.

Why Is Seed Dispersal Important To Plants?
  • After plants have already fertilized and grown
    seeds, dispersal is the last important step
    before the new offspring finally establish
    independence on their own. There are a number of
    reasons why seed dispersal is integral to the
    survival of a plant species, but the methods of
    dispersal are varied.

  • Before they can grow into new plants, seeds need
    to leave the seed pod. If all the seeds a plant
    produced landed just underneath the parent plant,
    they would be too crowded, and the established
    large plant might not leave them enough light or
    water for them all to develop properly. When you
    plant seeds too thickly in a pot, you can see
    that they grow tall and leggy, and each plant is
    weak and spindly. The various methods of seed
    dispersal are designed to ensure that as many
    seeds as possible have a good chance of growing
    up to produce seeds of their own.

  • On some plants native to Australia and South
    Africa, the seedpods may need the heat of the
    natural bush fires occurring in these areas to
    open and release their seeds, which are then
    dispersed by other means.

  • Sometimes, the pod or fruit containing the seeds
    is carried away from the parent plant sometimes,
    individual seeds are spread to a new location.
    The size and shape of the seedpod or the seeds
    influences how they are dispersed. The main
    methods plants use to disperse their seeds to
    places with better growing conditions than
    directly under the parent plant include gravity,
    animals, force, wind and water. Often, a plant
    will spread its seeds by a combination of these
    methods. For instance, a fruit falling to the
    ground by gravity might then be carried away by
    animals, or a seed blown by the wind might land
    in water and be transported somewhere else before

Quiz time!!!!!
  • Q1Name 1 type of dispersal of seeds.
  • Ans Water/ Force/ Wind/ Animal/ Splitting/
  • Q2 What does the seed need to leave first before
    it can grow into a new plant?
  • AnsThe seed pod

Quiz time!!!!!
  • Q3Are individual seeds spread to a new location?
  • Ans Yes
  • Q4what will happen when the seed is fertilised
    and grown seeds?
  • Ansdispersal

By Khee Ing , Azmina ,Ryan ,Justin.?
  • Thank you for listening to our presentation