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Adaptation In Plants
 

Adaptation In Plants

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    Adaptation In Plants Adaptation In Plants Presentation Transcript

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