Waec Model Questions Vol1 2019 Biology Question 4

Practice essay / theory question 4 from the 2019 Waec Model Questions Vol1 Biology examination. This question covers Plant Physiology .

Waec Model Questions Vol1 2019 Biology Essay / Theory

Topic: Plant Physiology

Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • essay

Water movement in plants is driven by physical forces that operate from roots to leaves.

Question Parts

( a )

Explain the cohesion‑tension theory and how it accounts for the ascent of sap.

( b )

Given that the water potential (Ψ) in the leaf air spaces is –0.12 MPa and the water potential in the root xylem is –0.03 MPa, calculate the overall water potential gradient driving the flow and state whether it is sufficient for upward movement.

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About This Question

This is Waec Model Questions Vol1 2019 Biology Question 4. It is one of the essay questions from the 2019 Waec Model Questions Vol1 Biology examination.

The question covers Plant Physiology .

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