Igcse Model Questions Vol1 2017 Biology Question 19

Practice objective / multiple choice question 19 from the 2017 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2017 Biology Objective / Multiple Choice Medium Difficulty
Question 19 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • objective

In a plant, the water potential of the soil is \(-0.2\) MPa. The root cells have a solute potential of \(-0.5\) MPa and generate a pressure potential of \(+0.3\) MPa. The leaf water potential is \(-0.8\) MPa. (a) Calculate the water potential of the root cells. (b) Determine the net driving force for water movement from the root to the leaf. (c) State the direction of water movement.

Answer Options

A. Root \(\Psi = -0.5\) MPa; driving force = 0.3 MPa; water moves upward from root to leaf.
Correct Answer B. Root \(\Psi = -0.2\) MPa; driving force = 0.6 MPa; water moves upward from root to leaf.
C. Root \(\Psi = -0.2\) MPa; driving force = 0.6 MPa; water moves downward from leaf to root.
D. Root \(\Psi = -0.1\) MPa; driving force = 0.9 MPa; water moves upward from root to leaf.
Correct Answer
B
Correct Option:
Root \(\Psi = -0.2\) MPa; driving force = 0.6 MPa; water moves upward from root to leaf.

About This Question

This is Igcse Model Questions Vol1 2017 Biology Question 19. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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