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Of what value to a plant is the ability to lose water through transpiration?

18. Of what value to a plant is the ability to lose water through transpiration?

  • Answer:

    It is thought that transpiration is the driving force of the cohesion-tension theory, which explains how water moves up a plant. 'Transpiration helps regulate leaf temperature. Loss of water is the result of necessary gas exchange, it is unavoidable. It is estimated that for every 400 molecules of water lost, 1 molecule of carbon dioxide is gained.

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The plant needs mineral salts (nitrates, potash and phosphates) from the soil and these are taken up in a dissolved form by the roots. If the plant continually took in water in order to obtain these salts, the tissues would swell and burst; the loss of water by transpiration prevents this from happening.

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