Neco 2025 Biology Question 5

Practice essay / theory question 5 from the 2025 Neco Biology examination. This question covers Transport in plants .

Neco 2025 Biology Essay / Theory

Topic: Transport in plants

Question 5 NECO • 2025 • BIOLOGY • essay

Plants depend on specialised tissues and physical mechanisms to move water and dissolved minerals from the roots to the leaves. Answer the following questions based on the transport processes in a typical flowering plant.

Question Parts

( a )

Explain how the structure of xylem vessels facilitates the upward movement of water from the roots to the shoots.

( b )

Compare and contrast root pressure and transpiration pull as mechanisms that move water in the xylem.

( c )

A potted plant is placed in a solution containing 0.5 mol L⁻¹ sucrose at 25 °C. Assuming the solution behaves as an ideal non‑electrolyte (i = 1) and that the pressure potential of the solution is zero, calculate the water potential (Ψ) of the solution. State the direction of net water movement between the plant’s root cells (Ψ ≈ 0) and the external solution.

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About This Question

This is Neco 2025 Biology Question 5. It is one of the essay questions from the 2025 Neco Biology examination.

The question covers Transport in plants .

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