Neco Model Questions Vol1 2018 Biology Question 5

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

Neco Model Questions Vol1 2018 Biology Essay / Theory
Topic: Transport
Question 5 NECO_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • essay

A 25‑metre‑tall mango tree growing in a tropical savanna experiences a daytime average relative humidity of 45 % and a temperature of 30 °C. The leaf area of the tree is approximately 150 m² and the measured rate of transpiration is 4 L day⁻¹.

Question Parts

( a )
Describe the complete pathway of water from soil to the leaves in this tree, naming the main tissues involved and the driving forces.
( b )
Assuming the water column in the xylem extends the full height of the tree, calculate the minimum tension (negative pressure) that must be generated in the xylem to raise water to the top of the tree. Use ρ = 1000 kg m⁻³ and g = 9.8 m s⁻². Express your answer in kilopascals (kPa).
( c )
Using the transpiration rate given, estimate the average volumetric flow rate of water through the xylem (in mL min⁻¹). Discuss whether the tension calculated in part (b) is sufficient to sustain this flow, considering the cohesion‑tension theory.

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About This Question

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

The question covers Transport .

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