Neco 2023 Biology Question 5

Practice essay / theory question 5 from the 2023 Neco Biology examination. This question covers transport in plants .

Neco 2023 Biology Essay / Theory
Topic: transport in plants
Question 5 NECO • 2023 • BIOLOGY • essay
Neco 2023 Biology Question 5 diagram

The diagram shows a transverse section of a mature dicot leaf. The labelled parts include the cuticle, upper epidermis, lower epidermis with a pair of stomata (guard cells shown), palisade mesophyll, spongy mesophyll, a vascular bundle containing xylem and phloem, and a surrounding bundle sheath. Using this diagram, answer the following questions.

Question Parts

( a )
Describe the complete pathway that a water molecule follows from the soil to the guard cells of a stomatal pore. In your answer, name each structure the water passes through and state the main physical or chemical driving force operating at that stage.
( b )
The leaf loses water by transpiration at a rate of 5 mm per day. The leaf area shown in the diagram is 30 cm². (i) Calculate the volume of water lost from the leaf in one day. (ii) The plant’s root system can absorb water at a maximum rate of 0.8 mL per hour. Determine whether the root system can supply enough water to replace the daily transpirational loss, showing all calculations.
( c )
Identify and discuss two structural adaptations shown in the diagram that help the leaf minimise water loss. Relate each adaptation to its functional significance.

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About This Question

This is Neco 2023 Biology Question 5. It is one of the essay questions from the 2023 Neco Biology examination.

The question covers transport in plants .

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