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Biology 23.4

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Biology 23.4

  1. 1. 23.4 Leaves <br />
  2. 2. Blade <br />Thin, flattened section of a plant leaf that collects sunlight<br />
  3. 3. Petiole<br />Thin stalk by which a leaf blade is attached to a stem<br />
  4. 4. Mesophyll<br />Specialized ground tissue that makes up the bulk of most leaves; performs most of a plant’s photosynthesis<br />
  5. 5. Palisade Mesophyll<br />Layer of tall, column-shaped mesophyll cells just under the upper epidermis of a leaf.<br />
  6. 6. Spongy Mesophyll<br />Loose tissue beneath the palisade layer of a leaf<br />
  7. 7. Stoma <br />Opening in the underside of a leaf that allows carbon dioxide and oxygen to diffuse into and out of the leaf<br />
  8. 8. Guard Cell<br />Specialized cell in the epidermis of plants that controls the opening and closing of stomata by responding to changes in water pressure<br />
  9. 9. Transpiration <br />Loss of water from a plant through its leaves<br />
  10. 10. Key Concept<br />The structure of a leaf is optimized for absorbing light and carrying out photosynthesis.<br />
  11. 11. Key Concept<br />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.<br />

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