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Unit 2

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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Unit 2

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  1. Unit 2 Seed dispersal How do seeds move fromplace to place? Seed dispersal: Unit 2

  2. Where do ducks carry seeds? Seed dispersal: Unit 2

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. Keston Ponds Here Darwin collected mud with lots of seeds in it Seed dispersal: Unit 2

  13. A duck inside and outside Seed dispersal: Unit 2

  14. Seed dispersal: Unit 2

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