Neco Model Questions Vol1 2024 Biology Question 1

Practice practical question 1 from the 2024 Neco Model Questions Vol1 Biology examination. This question covers Cell Structure, Microscopy, Measurement .

Neco Model Questions Vol1 2024 Biology Practical

Topics: Cell Structure Microscopy Measurement

Question 1 NECO_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • practical

You are given a prepared slide of human cheek cells stained with methylene blue and an ocular micrometer attached to a compound microscope. The ocular lens has a magnification of 10× and the objective lens used is 40×. One division on the ocular micrometer corresponds to 0.01 mm.

Question Parts

( a )

State the total magnification of the microscope.

( b )

You measured the diameter of a typical nucleus to be 25 divisions on the ocular micrometer. Calculate the actual diameter of the nucleus in micrometres (µm). Show all working.

( c )

Draw a labelled diagram of a typical cheek cell as observed, indicating the nucleus, cell membrane, cytoplasm and any other visible structures.

( d )

List three possible sources of error that could affect the measurement obtained in part (b) and suggest one way to minimise each error.

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This is Neco Model Questions Vol1 2024 Biology Question 1. It is one of the practical questions from the 2024 Neco Model Questions Vol1 Biology examination.

The question covers Cell Structure, Microscopy, Measurement .

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