Waec Model Questions Vol1 2022 Biology Question 5

Practice essay / theory question 5 from the 2022 Waec Model Questions Vol1 Biology examination. This question covers Transport .

Waec Model Questions Vol1 2022 Biology Essay / Theory

Topic: Transport

Question 5 WAEC_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • essay

A mature dicotyledonous plant is growing in a greenhouse where the temperature is 30 °C and the relative humidity is 40 %. The plant is watered with a 0.5 % (w/v) NaCl solution and its leaf surface area is 150 cm². The measured transpiration rate under these conditions is 4 mg H₂O·cm⁻²·h⁻¹.

Question Parts

( a )

Describe the complete pathway that water follows from the soil to the guard cells of a leaf, naming all the anatomical structures it passes through.

( b )

Explain how the presence of 0.5 % NaCl in the irrigation water influences the movement of water through the root and the rate of transpiration, using the concepts of osmotic potential and overall water potential.

( c )

Given the transpiration rate of 4 mg H₂O·cm⁻²·h⁻¹, calculate the total volume of water lost by the plant in 6 hours. Then discuss two physiological adjustments the plant could make to reduce water loss if the drought persists for several weeks.

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About This Question

This is Waec Model Questions Vol1 2022 Biology Question 5. It is one of the essay questions from the 2022 Waec Model Questions Vol1 Biology examination.

The question covers Transport .

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