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OB55 recall that seed formation follows fertilisation, and describe seed dispersal
Seeds can be dispersed in 5 ways:
1. Wind,
2. on Water,
3. Animals externally.
4 Animals internally .
5. Self-dispersal
Seed Dispersal
Dispersal is the scattering of individuals away from each other.
Dispersal reduces competition and increases the chances of colonisation of new suitable habitats.
Dispersal methods
(a) Wind dispersal: fluffy style of dandelions, winged fruit of sycamore.
(b) Animal dispersal: animal food berries of the bramble (blackberry hedge).
(i) Animals externally - attaching to animals burdock fruit
(ii) Animals internally – fleshy fruits are eaten by animals and the seeds pass out later.
(c) Water dispersal: air pockets in the seed coat of the water lily.
(d) Self-dispersal: seed pod of the pea flicks out the seeds.
attaching to animals burdock fruit
– peas and beans. Pods shriver and explode to release seeds.
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