Waec Model Questions Vol1 2020 Biology Question 1

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

Waec Model Questions Vol1 2020 Biology Practical

Topic: Cell Structure

Question 1 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • practical

A prepared slide of human cheek epithelial cells is examined under a compound microscope. The ocular micrometer has 100 divisions and the eyepiece magnification is 10×. The objective used is 40×. The ocular micrometer has been calibrated such that one division corresponds to 1 µm at the total magnification used. The distance between two opposite points of a typical cell measured on the ocular micrometer is 45 divisions.

Question Parts

( a )

Calculate the actual diameter of the cell in micrometres (µm).

( b )

Draw a labelled diagram of the cell as seen under the microscope. Include the cell membrane, cytoplasm, nucleus and indicate the measured diameter with an arrow.

( c )

State two precautions that should be observed to avoid error when measuring cell size with an ocular micrometer.

( d )

Identify two organelles that can be reliably observed in this preparation and briefly state one function of each.

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About This Question

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

The question covers Cell Structure .

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