Waec Model Questions Vol1 2020 Biology Question 5

Practice essay / theory question 5 from the 2020 Waec Model Questions Vol1 Biology examination. This question covers Transport .

Waec Model Questions Vol1 2020 Biology Essay / Theory

Topic: Transport

Question 5 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay

A 30‑metre‑tall tropical tree is growing in an area where the average atmospheric relative humidity is 70 % and the soil water potential is –0.05 MPa. The transpiration rate from the leaves is 5 × 10⁻⁵ m s⁻¹ and the cohesion‑tension theory states that a continuous water column can sustain a maximum tension of –0.2 MPa before cavitation occurs.

Question Parts

( a )

Describe the complete pathway that water follows from the soil to the leaves, naming the main tissues and processes involved.

( b )

Using the data given, estimate the greatest theoretical height to which water could be pulled up the tree before cavitation is likely to occur. Show the reasoning behind your calculation.

( c )

Identify two physiological or environmental factors that limit the actual maximum height of trees and explain how each factor reduces the height that can be achieved.

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About This Question

This is Waec Model Questions Vol1 2020 Biology Question 5. It is one of the essay questions from the 2020 Waec Model Questions Vol1 Biology examination.

The question covers Transport .

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