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Water potential is equal to

1. ψs + ψp
2. ψs = T.P.
3. ψp + ψw
4. ψs + ψp

Correct answer: ψs + ψp

Solution

Water potential (ψw) is determined by the combined effects of solute potential (ψs) and pressure potential (ψp). In plant physiology, ψw = ψs + ψp, so the correct choice is the one showing that sum.

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