Water moves from higher to lower water potential

Steps:

• Water potential (ψ) determines direction: higher ψ to lower ψ.
• From diagram, ψR > ψP > ψQ (R highest, Q lowest).
• Between P and Q: ψP > ψQ, so net flow P → Q.
• Between P and R: ψR > ψP, so net flow R → P (P ← R).

Why A is correct:

• Matches osmosis principle: water diffuses down ψ gradient, so P → Q (ψP > ψQ) and P ← R (ψR > ψP).

Why the others are wrong:

• B: Reverses both flows, ignoring ψ gradient direction.
• C: Implies both to P, but ψQ < ψP so no Q → P.
• D: Suggests P → Q correct but R → P wrong (actual R → P).

Final answer: A