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Biology 23.4
 

Biology 23.4

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    Biology 23.4 Biology 23.4 Presentation Transcript

    • 23.4 Leaves
    • Blade
      Thin, flattened section of a plant leaf that collects sunlight
    • Petiole
      Thin stalk by which a leaf blade is attached to a stem
    • Mesophyll
      Specialized ground tissue that makes up the bulk of most leaves; performs most of a plant’s photosynthesis
    • Palisade Mesophyll
      Layer of tall, column-shaped mesophyll cells just under the upper epidermis of a leaf.
    • Spongy Mesophyll
      Loose tissue beneath the palisade layer of a leaf
    • Stoma
      Opening in the underside of a leaf that allows carbon dioxide and oxygen to diffuse into and out of the leaf
    • Guard Cell
      Specialized cell in the epidermis of plants that controls the opening and closing of stomata by responding to changes in water pressure
    • Transpiration
      Loss of water from a plant through its leaves
    • Key Concept
      The structure of a leaf is optimized for absorbing light and carrying out photosynthesis.
    • Key Concept
      Plants keep their stomata open just enough to allow photosynthesis to take place but not so much that they lose an excessive amount of water.