Neco Model Questions Vol1 2019 Biology Question 1

Practice practical question 1 from the 2019 Neco Model Questions Vol1 Biology examination. This question covers Cell Structure .

Neco Model Questions Vol1 2019 Biology Practical
Topic: Cell Structure
Question 1 NECO_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • practical

You are given a prepared slide of an onion (Allium cepa) epidermal peel and a compound microscope equipped with an ocular micrometer calibrated at 0.01 mm per division.

Question Parts

( a )
Identify three cellular structures that can be observed in the slide and state one function of each.
( b )
A student measures the length of a typical rectangular epidermal cell as 45 divisions and its width as 30 divisions on the ocular micrometer. Calculate the actual length and width of the cell in micrometres (µm). Show all steps.
( c )
Determine the overall magnification used if the objective lens is 40× and the ocular lens is 10×. Then calculate the linear size of the cell as it appears on the screen (apparent size) in millimetres.
( d )
List two sources of error that could affect the accuracy of the measurements and suggest one way to minimise each error.

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About This Question

This is Neco Model Questions Vol1 2019 Biology Question 1. It is one of the practical questions from the 2019 Neco Model Questions Vol1 Biology examination.

The question covers Cell Structure .

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