Neco Model Questions Vol1 2022 Biology Question 5

Practice essay / theory question 5 from the 2022 Neco Model Questions Vol1 Biology examination. This question covers Transport .

Neco Model Questions Vol1 2022 Biology Essay / Theory

Topic: Transport

Question 5 NECO_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • essay

A mature tree 20 m tall is growing in a region where the average daytime transpiration pull at the leaf surface is –0.2 MPa. The tree loses water through its leaves at a rate of 150 g per hour. Root pressure measured in the same tree is 0.15 MPa.

Question Parts

( a )

Describe two structural adaptations of xylem vessels that enable the continuous upward movement of water in tall trees.

( b )

Calculate the theoretical tension (in N m⁻²) that must be generated to lift water from the roots to the top of the tree against gravity, using the given transpiration pull. Explain why root pressure alone cannot achieve this height.

( c )

Given the water loss of 150 g h⁻¹, estimate the volume of water (in mL) that must be absorbed by the roots each hour. Discuss two physiological mechanisms the tree employs to maintain water balance under this transpiration demand.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Neco Model Questions Vol1 2022 Biology Question 5. It is one of the essay questions from the 2022 Neco Model Questions Vol1 Biology examination.

The question covers Transport .

View More Neco Model Questions Vol1 2022 Biology Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support