Biology 13.4 Gas Exchange in the Leaf of a Plant

  • Created by: Anna
  • Created on: 13-05-13 00:00
  • Photosynthesis taking place - although some CO2 comes from respiration of cells, most has to be obtained from external air - some oxygen from photosynthesis is used in respiration but most of it diffuses out of the plant.
  • Photosynthesis not occuring - oxygen diffuses into the leaf because it is constantly used by cells during respiration - carbon dioxide produced diffuses out.

Structure of a leaf and gas exchange

  • No living cell is far away from external air (source of oxygen and CO2)
  • Diffusion takes place in the gas phase (air) - so…


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