Waec Model Questions Vol1 2018 Biology Question 1

Practice practical question 1 from the 2018 Waec Model Questions Vol1 Biology examination. This question covers Cell Structure .

Waec Model Questions Vol1 2018 Biology Practical

Topic: Cell Structure

Question 1 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • practical

A fresh transverse section of an onion (Allium cepa) epidermis was prepared using a hand‑section technique and observed under a compound microscope at 400× magnification. The average dimensions of five typical cells measured with an ocular micrometer are: length = 30 µm, width = 15 µm, thickness = 5 µm.

Question Parts

( a )

Calculate the surface area (SA) and volume (V) of a typical cell, assuming the cell is a rectangular prism. Show all steps.

( b )

Determine the surface‑area‑to‑volume ratio (SA/V) and explain why a high SA/V ratio is advantageous for plant epidermal cells.

( c )

Identify two cellular structures that can be observed in the preparation and state one function of each.

( d )

List two possible sources of experimental error in the measurement of cell dimensions and suggest a way to minimise each.

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About This Question

This is Waec Model Questions Vol1 2018 Biology Question 1. It is one of the practical questions from the 2018 Waec Model Questions Vol1 Biology examination.

The question covers Cell Structure .

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