Amethyst190
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Give two reasons why the potometer does not truly measure the rate of transpiration.
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HarisMalik98
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Potometers only measure the uptake of water. Not all water up taken by the plant roots is necessarily involved in transpiration... some may be used for photosynthesis or to maintain tugor pressure (2 reasons) etc.

A device that measures the true rate of transpiration would measure water evaporation at the leaves.
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Amethyst190
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(Original post by HarisMalik98)
Potometers only measure the uptake of water. Not all water up taken by the plant roots is necessarily involved in transpiration... some may be used for photosynthesis or to maintain tugor pressure (2 reasons) etc.

A device that measures the true rate of transpiration would measure water evaporation at the leaves.
Thank you so much!!
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