Neco 2019 Biology Question 5

Practice essay / theory question 5 from the 2019 Neco Biology examination. This question covers transport .

Neco 2019 Biology Essay / Theory

Topic: transport

Question 5 NECO • 2019 • BIOLOGY • essay

A cross‑section of a typical dicot leaf is shown in the labelled diagram.

Question Parts

( a )

Identify and label on the diagram the structures that are directly involved in the upward movement of water from the roots to the leaves.

( b )

Explain, using the cohesion‑tension theory, how water is able to move upward through the xylem vessels. In your answer, discuss the roles of (i) cohesion, (ii) adhesion, (iii) transpiration pull, and (iv) the continuity of the water column.

( c )

A plant is placed in a greenhouse where the relative humidity is increased from 40 % to 80 % while temperature remains constant at 25 °C. Predict and justify the effect of this change on the rate of transpiration and on the overall water uptake by the plant.

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About This Question

This is Neco 2019 Biology Question 5. It is one of the essay questions from the 2019 Neco Biology examination.

The question covers transport .

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