Igcse Model Questions Vol1 2024 Biology Question 5

Practice essay / theory question 5 from the 2024 Igcse Model Questions Vol1 Biology examination. This question covers Transport, Plant physiology, Xylem .

Igcse Model Questions Vol1 2024 Biology Essay / Theory

Topics: Transport Plant physiology Xylem

Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • essay

A tall tree relies on its vascular system to transport water from the roots to the leaves.

Question Parts

( a )

Explain how water moves from the roots to the leaves in a tall tree, describing the roles of cohesion, adhesion and transpiration pull.

( b )

A tree 15 m tall has a leaf water potential of –1.5 MPa and a root water potential of –0.4 MPa. The hydraulic conductivity of its xylem is 4 × 10⁻⁹ m³·MPa⁻¹·s⁻¹ per metre of length. Assuming water moves through a single continuous column of xylem equal to the tree height, calculate the volumetric flow rate of water in µL·s⁻¹. Show all steps of your reasoning.

( c )

Discuss two environmental factors that could reduce the rate of water transport in the tree and explain the physiological consequences for the plant.

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About This Question

This is Igcse Model Questions Vol1 2024 Biology Question 5. It is one of the essay questions from the 2024 Igcse Model Questions Vol1 Biology examination.

The question covers Transport, Plant physiology, Xylem .

View More Igcse Model Questions Vol1 2024 Biology Questions More Igcse Model Questions Vol1 Practice Questions Back to Questions

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