why pmc is not giving accurate results?
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If the device could measure the loss of water due to Transpiration or Guttation then it would have been very accurate.
It doesn't measure the extent and duration of transpiration either.
It only measures the amount of uptake of water by the plants. The water taken up can be used for Transpiration or photosynthesis too. Hence the measurement is not very accurate.
So the correct answer is 'It measures the water absorbed by the plant'.
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