Waec Model Questions Vol1 2018 Biology Question 5

Practice essay / theory question 5 from the 2018 Waec Model Questions Vol1 Biology examination. This question covers Transport .

Waec Model Questions Vol1 2018 Biology Essay / Theory
Topic: Transport
Question 5 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

Consider the processes of transport of water, minerals and organic nutrients in plants and the transport of gases and nutrients in the human circulatory system.

Question Parts

( a )
Explain the mechanism of upward movement of water in the xylem, including the role of transpiration pull and the cohesion‑tension theory.
( b )
A plant is growing in a region where the soil water potential is –0.15 MPa and the leaf water potential is –0.45 MPa. Assuming negligible resistance in the xylem, calculate the theoretical rate of water flow per unit cross‑sectional area if the hydraulic conductivity of the xylem is 5 × 10⁻⁴ m·s⁻¹·MPa⁻¹. Show all steps of your reasoning.
( c )
Compare the transport of glucose in the phloem (pressure‑flow hypothesis) with the transport of oxygen in the blood. Highlight two similarities and two differences.
( d )
A patient suffers from anaemia that reduces the haemoglobin concentration by 30 %. Discuss how this affects the efficiency of oxygen transport and what physiological compensations may occur.

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About This Question

This is Waec Model Questions Vol1 2018 Biology Question 5. It is one of the essay questions from the 2018 Waec Model Questions Vol1 Biology examination.

The question covers Transport .

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