Seed dispersal

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Seed dispersal

  1. 1. Seed Dispersal<br />8SCIENCE Thurs. March 24, 2011<br />
  2. 2. Review: Seed Plants<br />What are the two types of seed plants?<br />Gymnosperms<br />Angiosperms <br />What is the difference?<br />Gymnosperms have cones<br />Angiosperms rely on pollination<br />Today we will learn about how seeds formed in gymnosperms or angiosperms are dispersed (spread)<br />
  3. 3. Seed Dispersal<br />Seeds need to get from where they are formed to the ground to grow into a new plant<br />How do seeds get to the ground?<br />Gravity<br />What abiotic/biotic factors help to spread seeds?<br />Animals<br />Water <br />Wind <br />
  4. 4. Animal dispersal<br />Some seeds are eaten in fruits and dispersed as animals move around<br />‘Hitchhiking’<br />Attaching to animal fur/skin/clothing can help to disperse seeds<br />Ex: apple seeds, burs<br />
  5. 5. Water dispersal<br />Rain may cause seeds to fall out of a fruit or cone<br />Rivers/oceans may carry seeds to new locations<br />Some seeds float<br />Ex: Coconut palm seed<br />
  6. 6. Wind dispersal<br />Some seeds have special structures that allow them to be carried by the wind<br />If seeds are very small they may be carried far on the wind<br />Ex. Dandelion seeds<br />
  7. 7. How does the seed structure relate to how it is dispersed?<br />

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