Neco 2020 Biology Question 5

Practice essay / theory question 5 from the 2020 Neco Biology examination. This question covers transport, plant physiology, xylem, phloem, transpiration .

Neco 2020 Biology Essay / Theory
Topics: transport plant physiology xylem phloem transpiration
Question 5 NECO • 2020 • BIOLOGY • essay
Neco 2020 Biology Question 5 diagram

The diagram shows a transverse section of a dicot leaf with labelled structures involved in the transport of water and nutrients.

Question Parts

( a )
Identify and write the correct label for each structure that participates in the transport of water and mineral nutrients from the roots to the leaf.
( b )
Explain, using the labelled structures, the complete pathway of water from the soil to the interior of the leaf. Include the physical forces that drive each step.
( c )
A leaf of this species has an area of 50 cm². The average stomatal conductance (gₛ) measured during a sunny day is 0.20 mol m⁻² s⁻¹ and the ambient vapour pressure deficit (VPD) is 1.5 kPa.\n\n(i) Calculate the instantaneous transpiration rate (E) in mmol m⁻² s⁻¹ using the relation E = gₛ × VPD (where 1 kPa ≈ 1 mol m⁻³).\n(ii) Determine the total amount of water (in millimoles) lost from the leaf per second.
( d )
Discuss two morphological or physiological adaptations that plants exhibit to reduce excessive water loss, linking each adaptation to features shown in the diagram.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Neco 2020 Biology Question 5. It is one of the essay questions from the 2020 Neco Biology examination.

The question covers transport, plant physiology, xylem, phloem, transpiration .

View More Neco 2020 Biology Questions More Neco Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support