Neco 2018 Biology Question 5

Practice essay / theory question 5 from the 2018 Neco Biology examination. This question covers Transport, Plant Physiology, Xylem, Cohesion‑tension theory .

Neco 2018 Biology Essay / Theory

Topics: Transport Plant Physiology Xylem Cohesion‑tension theory

Question 5 NECO • 2018 • BIOLOGY • essay

Discuss the mechanisms of transport of water and minerals in higher plants, and explain how these mechanisms are adapted to different environmental conditions.

Question Parts

( a )

Describe the structure of xylem vessels and explain how this structure facilitates the upward movement of water.

( b )

Explain the cohesion‑tension theory and illustrate how it accounts for the ascent of sap from roots to leaves.

( c )

Compare the transport of water in a well‑watered plant with that in a drought‑stressed plant, highlighting the physiological adjustments that occur.

( d )

Evaluate the impact of increased soil salinity on the rate of water uptake, using relevant concepts of osmosis and ion toxicity.

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About This Question

This is Neco 2018 Biology Question 5. It is one of the essay questions from the 2018 Neco Biology examination.

The question covers Transport, Plant Physiology, Xylem, Cohesion‑tension theory .

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