Igcse Model Questions Vol1 2023 Biology Question 1

Practice practical question 1 from the 2023 Igcse Model Questions Vol1 Biology examination. This question covers Cell Structure .

Igcse Model Questions Vol1 2023 Biology Practical
Topic: Cell Structure
Question 1 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • practical

You are provided with a clean microscope, an ocular micrometer (scale = 0.01 mm per division) and a fresh cheek cell smear. Using the microscope you are to determine the average diameter of the cheek cells.

Question Parts

( a )
Describe the complete procedure for preparing a fresh cheek cell smear that is suitable for measuring cell diameter with an ocular micrometer.
( b )
You measured the diameters of 25 cells and recorded the number of micrometer divisions that spanned each cell as follows: 5, 4, 5, 6, 5, 5, 4, 5, 5, 6, 5, 4, 5, 5, 5, 4, 6, 5, 5, 5, 4, 5, 5, 6, 5. Calculate the average cell diameter in micrometres (µm). Show all steps of your calculation.
( c )
The textbook value for the average diameter of human cheek cells is 50 µm. (i) Calculate the percentage error of your experimental result. (ii) Suggest two possible sources of error that could have affected your measurement.

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About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 1. It is one of the practical questions from the 2023 Igcse Model Questions Vol1 Biology examination.

The question covers Cell Structure .

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