Neco Model Questions Vol1 2025 Biology Question 5

Practice essay / theory question 5 from the 2025 Neco Model Questions Vol1 Biology examination. This question covers Transport, Plant physiology .

Neco Model Questions Vol1 2025 Biology Essay / Theory
Topics: Transport Plant physiology
Question 5 NECO_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • essay

A tropical fruit tree is growing in a region where the soil water content has decreased significantly due to a prolonged dry season. The tree shows wilting of young leaves while older leaves remain turgid.

Question Parts

( a )
Explain the complete pathway of water movement from the soil to a leaf in a typical dicotyledonous plant, mentioning the specific role of each tissue involved (roots, xylem and leaves).
( b )
Considering the situation described, discuss two physiological adjustments the tree might make to maintain water transport under drought stress.
( c )
If the solute concentration in the root cortical cells increases from 0.15 mol L⁻¹ to 0.30 mol L⁻¹, calculate the change in the water potential (Ψw) of the root cells, assuming the temperature is 25 °C and the pressure potential remains unchanged. Use Ψs = –i C R T (i = 1, R = 0.0831 L·bar·K⁻¹·mol⁻¹, T = 298 K). State the new water potential value and explain how this change influences water uptake from the soil.

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About This Question

This is Neco Model Questions Vol1 2025 Biology Question 5. It is one of the essay questions from the 2025 Neco Model Questions Vol1 Biology examination.

The question covers Transport, Plant physiology .

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