Waec Model Questions Vol1 2022 Biology Question 1

Practice practical question 1 from the 2022 Waec Model Questions Vol1 Biology examination. This question covers Cell Structure .

Waec Model Questions Vol1 2022 Biology Practical
Topic: Cell Structure
Question 1 WAEC_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • practical

You are given a prepared slide of human cheek epithelial cells stained with methylene blue. Using a light microscope with a 10× ocular lens and a 40× objective lens, you are to determine the average cell diameter and calculate the surface‑area‑to‑volume ratio of a typical cell.

Question Parts

( a )
Record the diameter (in µm) of ten different cells as measured with the ocular micrometer. Use the data provided in the table below. | Cell | Diameter (µm) | |------|---------------| | 1 | 12 | | 2 | 13 | | 3 | 11 | | 4 | 14 | | 5 | 13 | | 6 | 12 | | 7 | 15 | | 8 | 13 | | 9 | 12 | |10 | 14 |
( b )
Calculate the mean diameter of the cells (to one decimal place).
( c )
Assuming the cells are spherical, calculate: i. The average surface area (µm²). ii. The average volume (µm³).
( d )
Determine the surface‑area‑to‑volume ratio of a typical cell (expressed as µm⁻¹, to two decimal places).
( e )
Mention any two possible sources of error that could affect the accuracy of your measurements.

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About This Question

This is Waec Model Questions Vol1 2022 Biology Question 1. It is one of the practical questions from the 2022 Waec Model Questions Vol1 Biology examination.

The question covers Cell Structure .

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