Igcse Model Questions Vol1 2020 Biology Question 1

Practice practical question 1 from the 2020 Igcse Model Questions Vol1 Biology examination. This question covers Cell Structure .

Igcse Model Questions Vol1 2020 Biology Practical

Topic: Cell Structure

Question 1 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • practical

A sample of cheek epithelial cells is prepared on a slide using a drop of methylene blue stain. The slide is examined under a light microscope equipped with an ocular micrometer calibrated at 0.01 mm per division.

Question Parts

( a )

Describe the procedure for preparing the slide and observing the cells under the microscope.

( b )

Using the ocular micrometer, the following five cell diameters (in divisions) are recorded from five different fields: 23, 27, 25, 24, 26. Calculate the average cell diameter in micrometres (µm). Show your working.

( c )

Assuming the cells are approximately spherical, calculate the average cell volume in cubic micrometres (µm³). Use V = \(\frac{4}{3}\pi r^{3}\) and take \(\pi = 3.14\). State any assumptions and comment on one possible source of error in the volume determination.

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About This Question

This is Igcse Model Questions Vol1 2020 Biology Question 1. It is one of the practical questions from the 2020 Igcse Model Questions Vol1 Biology examination.

The question covers Cell Structure .

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