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

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Presentation on theme: "Unit 2 Seed dispersal How do seeds move from place to place? Seed dispersal: Unit 2."— Presentation transcript:

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

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

3 Acorns: How far do they fall from the tree ate-oak/quercus-robur/video- 09b.html ate-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? ate-oak/quercus-robur/video- 11c.html ate-oak/quercus-robur/video- 11c.html Gravity Darwin’s ways of working: Unit 1Seed dispersal: Unit 2

4 Dandelion (Taraxacum officinale) What helps the seed to move? “beautifully plumed seed” Charles Darwin, On the Origin of Species, dandelion/taraxacum-officinale- agg/video-09.html Can you think of other ways that make seeds light enough to be blown on the wind? Wind Darwin’s ways of working: Unit 1Seed dispersal: Unit 2

5 Sycamore (Acer pseudoplatanus) How tall is a fully grown Sycamore tree? acer-pseudoplatanus/image- A6856.html acer-pseudoplatanus/image- A6856.html Does each seed fall straight down? acer-pseudoplatanus/video- 09b.html acer-pseudoplatanus/video- 09b.html Gravity and wind

6 Seed dispersal: Unit 2 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? Pepper Pot (sways on the stalk)

7 Blackberry (Rubus fruticosus) Which of these berries do you think will be eaten first? 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 Cleavers (Galium aparine) How do you think the fruits of cleavers move around? studies- council.org/urbaneco/urban eco/introduction/colonisatio n.htm studies- council.org/urbaneco/urban eco/introduction/colonisatio n.htm Which wild animals could do this? Animals - clinging Seed dispersal: Unit 2

9 Marsh marigold (Caltha palustris) Where do they live? What do you think will happen to the seeds when they fall out of the pod? marsh-marigold/caltha- palustris/ image- A16924.html Water Seed dispersal: Unit 2

10 Sweet pea seed (Lathyrus odoratus) When will the seed pod be dry enough to suddenly explode and twist? Why do the seeds spray away from the Plant? How far can these seeds travel? Explosive - springing apart Seed dispersal: Unit 2

11 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? Explosive - pushing forward Seed dispersal: Unit 2

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

13 A duck inside and outside Seed dispersal: Unit 2

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