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Seed Dispersal How does it happen?

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Its wings make it spin like a helicopter and carry it far from the parent tree. ... On rare occasions, birds such as blue jays can transport acorns long distances. ... – PowerPoint PPT presentation

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Title: Seed Dispersal How does it happen?


1
Seed Dispersal How does it happen?
2
Wind Dispersal
3
WIND DISPERSAL
  • Pepperpots Parachutes Spinners

(RED CAMPION) The flower dries out into a hollow
container inside which seeds are rattled out.
(SYCAMORE) Its wings make it spin like a
helicopter and carry it far from the parent tree.
(DANDELION) Feathery hairs help the seed to float
on the wind. They can be carried very far this
way.
Wind dispersal is most common for smaller,
lighter seeds.
4
WATER DISPERSAL
  • Seeds of plants which grow near water may
  • be carried far away by streams rivers.
  • How do you think the seeds eventually begin
    growing in this case?

5
EXPLOSIVE DISPERSAL
  • Some plants distribute their seeds by violently
    ejecting
  • them so that they fall well away from the parent
    plant.

Gorse is a good example of this. Sitting near
Gorse bushes on a hot day in summer you can hear
exploding pods sound almost like gun shots.
6
ANIMAL DISPERSAL - 1
Animals, including humans, have a big role to
play in seed dispersal.
  • Some species of plant use hooks on their
  • fruits to attach themselves to the fur of
  • mammals or feathers of birds or even the clothes
    of humans!

7
ANIMAL DISPERSAL - 2
  • The seeds of many plants are dispersed after
    passing through the digestive system of animals
    that have eaten them.
  • What kind of animals would eat these fruits/seeds?

8
ANIMAL DISPERSAL - 3
  • Hard nuts are usually destroyed if chewed or
    eaten. 
  • However, animals such as squirrels may store them
    to eat later and forget to go back to get them,
    giving them a chance to germinate. 
  • On rare occasions, birds such as blue jays can
    transport acorns long distances.
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