Waec Model Questions Vol1 2022 Biology Question 44

Practice objective / multiple choice question 44 from the 2022 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2022 Biology Objective / Multiple Choice Medium Difficulty
Question 44 WAEC_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

In a plant, the soil water potential is taken as 0 MPa. Root cells generate a root pressure of +0.3 MPa and have a solute (osmotic) potential of -0.5 MPa. (a) Calculate the water potential of the root cells. (b) State the direction of water movement between the soil and the root. (c) If the leaf water potential is -1.2 MPa, what is the overall water‑potential gradient driving water from the soil to the leaf?

Answer Options

A. a) -0.5 MPa; b) from soil into the root; c) 1.5 MPa gradient from soil (0 MPa) to leaf (‑1.5 MPa)
B. a) -0.2 MPa; b) from soil into the root; c) 0.9 MPa gradient from soil (0 MPa) to leaf (‑0.9 MPa)
Correct Answer C. a) -0.2 MPa; b) from soil into the root; c) 1.2 MPa gradient from soil (0 MPa) to leaf (‑1.2 MPa)
D. a) -0.8 MPa; b) from root into the soil; c) 0.8 MPa gradient from soil (0 MPa) to leaf (‑1.2 MPa)
Correct Answer
C
Correct Option:
a) -0.2 MPa; b) from soil into the root; c) 1.2 MPa gradient from soil (0 MPa) to leaf (‑1.2 MPa)

About This Question

This is Waec Model Questions Vol1 2022 Biology Question 44. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Biology examination.

Difficulty level: Medium .

View More Waec Model Questions Vol1 2022 Biology Questions More Waec Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support