Neco 2017 Biology Question 5

Practice essay / theory question 5 from the 2017 Neco Biology examination. This question covers Transport .

Neco 2017 Biology Essay / Theory

Topic: Transport

Question 5 NECO • 2017 • BIOLOGY • essay

A researcher is studying water transport in a tall Eucalyptus tree that is 20 m high. Measurements of water potential (Ψ) are as follows: at the soil‑root interface Ψ = -0.2 MPa, at the base of the trunk Ψ = -0.5 MPa and at the leaf tip Ψ = -1.5 MPa. The average hydraulic conductivity (L) of the xylem is 5 \times 10^{-7} \text{ m}^3\text{ MPa}^{-1}\text{ s}^{-1}.

Question Parts

( a )

Explain the three main mechanisms that contribute to the upward movement of water in the tree, indicating which of the measured water potentials each mechanism primarily overcomes.

( b )

Using the given hydraulic conductivity, estimate the volumetric flow rate of water through the xylem (in cm³·s⁻¹). Show all calculation steps and state any assumptions you make.

( c )

Discuss two environmental factors that could reduce water‑transport efficiency in this tree and suggest one physiological adaptation the tree might possess to mitigate each factor.

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About This Question

This is Neco 2017 Biology Question 5. It is one of the essay questions from the 2017 Neco Biology examination.

The question covers Transport .

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