Aditya, a 17 year old male from Noida, India asks on June 7, 2006,How does plant's inner cells respire?
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The living cells of a plant are all near the surface where air (oxygen or CO2) can reach all cells by diffusion. Diffusion is a process that involves gas (and other) molecules just passing through microscopic spaces between cells, or via the water surrounding cells. The most inner cells of a plant, such as a tree, are dead and do not respire. You can learn more about this at the excellent online biology textbook of John W. Kimball
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