Neco 2022 Biology Question 1

Practice practical question 1 from the 2022 Neco Biology examination. This question covers Cell Structure .

Neco 2022 Biology Practical

Topic: Cell Structure

Question 1 NECO • 2022 • BIOLOGY • practical

A student uses a light microscope to examine a prepared slide of cheek epithelial cells. The microscope has an ocular lens of 10× magnification and an objective lens of 40×. The ocular micrometer scale has 100 divisions. To calibrate the micrometer, the student first observes a stage micrometer slide where each division corresponds to 0.01 mm. Under the 40× objective, the student records that 25 divisions of the ocular micrometer span a distance of 0.25 mm on the stage micrometer.

Question Parts

( a )

Determine the value of one division of the ocular micrometer in micrometres (µm) at the 40× objective.

( b )

Using the calibrated ocular micrometer, the student measures the diameter of a typical cheek epithelial cell as 12 ocular divisions. Calculate the actual diameter of the cell in µm.

( c )

If the student switches to a 100× oil immersion objective (keeping the same ocular lens), what will be the new value of one ocular division in µm? (Assume the same calibration factor applies proportionally.)

( d )

Discuss two sources of error that could affect the accuracy of the cell size measurement.

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About This Question

This is Neco 2022 Biology Question 1. It is one of the practical questions from the 2022 Neco Biology examination.

The question covers Cell Structure .

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