Adaptation In Plants

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Adaptation In Plants

  1. 1. Lesson objective To describe how plants are adapted to live in their particular habitat . Adaptations in plants
  2. 2. AQA Science © Nelson Thornes Ltd 2006 
  3. 3. Plants take in water through their roots in the soil… Transpiration
  4. 4. Transpiration <ul><li>… it moves up through the plant… </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  5. 5. Transpiration <ul><li>… ..and is lost through the leaves in the transpiration stream. </li></ul>AQA Science © Nelson Thornes Ltd 2006  Corel 178(NT)
  6. 6. Transpiration AQA Science © Nelson Thornes Ltd 2006 
  7. 7. Stomata <ul><li>There are small openings called stomata in the leaves of a plant. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  8. 8. <ul><li>These open to allow gases in and out for photosynthesis and respiration. But at the same time water is lost by evaporation. </li></ul>Stomata AQA Science © Nelson Thornes Ltd 2006 
  9. 9. Rate of transpiration <ul><li>When it is hot and dry, photosynthesis and respiration take place quickly. As a result, plants also very quickly lose water. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  10. 10. The potometer A potometer can be used to measure the rate of transpiration.
  11. 11. Rate of transpiration <ul><li>As the leaf loses water, so the air bubble moves. The distance moved over a time period is measured. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  12. 12. Transpiration rate <ul><li>Graph of bubble movement against time. </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  13. 13. Transpiration rate <ul><li>The steeper the graph, the faster the transpiration rate! </li></ul>AQA Science © Nelson Thornes Ltd 2006 
  14. 14. <ul><li>Which potometer experiment was run in drier air? </li></ul>Transpiration rate AQA Science © Nelson Thornes Ltd 2006 
  15. 15. <ul><li>The drier the air, the faster the transpiration rate! </li></ul>Transpiration rate AQA Science © Nelson Thornes Ltd 2006 
  16. 16. Adaptations for plants growing in a dry environment <ul><li>Curled leaves. </li></ul>AQA Science © Nelson Thornes Ltd 2006  <ul><li>Moist air trapped inside the curl. </li></ul><ul><li>Thick waxy cuticle. </li></ul><ul><li>Stomata on the curled side only. </li></ul>
  17. 17. Adaptations for plants growing in a dry environment <ul><li>Marram grass leaves will even uncurl slightly in the wet and curl up more in the dry. </li></ul>AQA Science © Nelson Thornes Ltd 2006  Corel 46(NT)

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