1 / 15

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

phillipa
Télécharger la présentation

Unit 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related