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Why is water uptake used as a measure of transpiration rate?
A
Water is lost faster than the roots can take it up, so cells lose pressure and the plant droops.
B
It removes the damp air layer outside the leaf and replaces it with drier air.
C
Over 99% of absorbed water is lost as vapour, so uptake closely measures transpiration.
D
In dry air, the concentration gradient of water vapour is steep.
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2.2.9 Environmental factors and water uptake Flashcards
20 flashcards on OCR GCSE Biology 2.2.9 Environmental factors and water uptake: the key terms, definitions and processes you need to recall for the written papers.