Neco 2019 Biology Question 16

Practice objective / multiple choice question 16 from the 2019 Neco Biology examination.

Neco 2019 Biology Objective / Multiple Choice Medium Difficulty
Question 16 NECO • 2019 • BIOLOGY • objective

In a plant, the water potential of the leaf cells is determined by their solute concentration. The leaf cells contain 0.15 mol\,L^{-1} of a non‑ionic solute at 25\,\degree C (298\,K). The universal gas constant is \(R = 0.008314\)\,MPa\,L\,mol^{-1}\,K^{-1}. The pressure potential of the leaf cells is negligible. The water potential of the xylem supplying the leaf is \(-0.30\)\,MPa. Calculate the osmotic potential of the leaf cells, the resulting leaf water potential, and state whether water will move into or out of the leaf cells from the xylem. Also give the magnitude of the water‑potential gradient (\(\Delta\Psi\)) between xylem and leaf.

Answer Options

A. Water moves into the leaf; \(\Delta\Psi = 0.10\)\,MPa
B. Water moves into the leaf; \(\Delta\Psi = 0.05\)\,MPa
Correct Answer C. Water moves into the leaf; \(\Delta\Psi = 0.07\)\,MPa
D. Water moves out of the leaf; \(\Delta\Psi = 0.07\)\,MPa
Correct Answer
C
Correct Option:
Water moves into the leaf; \(\Delta\Psi = 0.07\)\,MPa

About This Question

This is Neco 2019 Biology Question 16. It is one of the objective questions from the 2019 Neco Biology examination.

Difficulty level: Medium .

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