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Potometer works on the principle of:

1. osmotic pressure
2. amount of water absorbed equals the amount transpired
3. root pressure
4. potential difference between the tip of the tube and that of the plant

Correct answer: amount of water absorbed equals the amount transpired

Solution

A potometer does not measure transpiration directly; it measures the rate of water uptake by a cut shoot. This works because, under normal conditions, the amount of water absorbed is approximately equal to the amount transpired.

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