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Unit 2. Seed dispersal How do seeds move from place to place?. Seed dispersal: Unit 2. Where do ducks carry seeds?. Seed dispersal: Unit 2. Gravity. Acorns: • How far do they fall from the tree http://www.arkive.org/pedunculate-oak/quercus-robur/video-09b.html

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Presentation Transcript
slide1

Unit 2

Seed dispersal

How do seeds move

fromplace to place?

Seed dispersal: Unit 2

where do ducks carry seeds

Where do ducks carry seeds?

Seed dispersal: Unit 2

slide3

Gravity

Acorns:

• How far do they fall from the

treehttp://www.arkive.org/pedunculate-oak/quercus-robur/video-09b.html

• Mammals and birds bury acorns to eat in the winter. What happens to the ones left in the ground?http://www.arkive.org/pedunculate-oak/quercus-robur/video-11c.html

Darwin’s ways of working: Unit 1

Seed dispersal: Unit 2

slide4

Wind

Dandelion

(Taraxacum officinale)

• What helps the seed to move?

“beautifully plumed seed”

Charles Darwin, On the Origin of

Species, 1859

http://www.arkive.org/common-dandelion/taraxacum-officinale-agg/video-09.html

• Can you think of other ways that make seeds light enough to be blown on the wind?

Darwin’s ways of working: Unit 1

Seed dispersal: Unit 2

slide5
Sycamore

(Acer pseudoplatanus)

• How tall is a fully grown

Sycamore tree?http://www.arkive.org/sycamore/acer-pseudoplatanus/image-A6856.html

• Does each seed fall straight

down?http://www.arkive.org/sycamore/acer-pseudoplatanus/video-09b.html

Gravity and wind

Seed dispersal: Unit 2

slide6

Pepper Pot (sways on the stalk)

Common Poppy

(Papaver rhoeas)

• Where does the seed come out?

• About how tall is a poppy flower?

• What could cause the stalk to

sway?

• Why do you think each poppy

plant can produce around 17,000

seeds?

Seed dispersal: Unit 2

slide7
Blackberry

(Rubus fruticosus)

• Which of these berries do

you thinkwill be eaten first?

http://www.arkive.org/harvest-mouse/micromys-minutus/video-08a.html

• What happens to the seed after the fruit has been eaten?

Animals - eating

Count the number of blackberries on this branch. Each one will have about 10 sections each with a seed. How many seeds are on this one branch?

Seed dispersal: Unit 2

slide8

Animals - clinging

Cleavers

(Galium aparine)

• How do you think the fruits of cleavers move around?http://www.field-studies-council.org/urbaneco/urbaneco/introduction/colonisation.htm

• Which wild animals could do this?

Seed dispersal: Unit 2

slide9

Water

Marsh marigold

(Caltha palustris)

• Where do they live?

• What do you think will happen to the seeds when they fall out of the pod?

http://www.arkive.org/marsh-marigold/caltha-palustris/ image-A16924.html

Seed dispersal: Unit 2

slide10

Explosive - springing apart

  • Sweet pea seed
  • (Lathyrus odoratus)
  • When will the seed podbe dry enough to suddenly explode and twist?
  • • Why do the seeds spray away from the Plant?
  • • How far can these seeds
  • travel?

Seed dispersal: Unit 2

slide11

Explosive - pushing forward

  • Squirting cucumber
  • (Ecballium elaterium)
  • These plants live in hot dry
  • countries. When drops of rain
  • hit the ripe fruit they push off the
  • plant squirting their seeds
  • behind them.
  • • Why is rain a helpful trigger?

Seed dispersal: Unit 2

slide12

Keston Ponds

Here Darwin collected mud with lots of seeds in it

Seed dispersal: Unit 2

slide13

A duck inside and outside

Seed dispersal: Unit 2