Neco 2017 Biology Question 1

Practice practical question 1 from the 2017 Neco Biology examination. This question covers Cell Structure, Microscopy, Magnification, Measurement .

Neco 2017 Biology Practical
Topics: Cell Structure Microscopy Magnification Measurement
Question 1 NECO • 2017 • BIOLOGY • practical

You are given a prepared slide of an unknown plant cell and a compound microscope with an ocular lens of 10× and objective lenses of 4×, 10× and 40×. A stage micrometer with divisions of 0.01 mm is placed on the stage. Perform the tasks described below.

Question Parts

( a )
State the total magnification when the 40× objective is used.
( b )
The micrometer shows that 25 divisions correspond to 0.25 mm in reality. On the same field, the length of the observed cell spans 150 divisions of the reticle. Calculate the actual length of the cell in micrometres (µm).
( c )
Draw a labelled diagram of the cell showing at least five organelles. Include the cell wall, plasma membrane, nucleus, vacuole and chloroplast. Indicate the relative positions of the organelles clearly.
( d )
Mention two precautions that should be observed when preparing the slide to avoid artefacts.

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About This Question

This is Neco 2017 Biology Question 1. It is one of the practical questions from the 2017 Neco Biology examination.

The question covers Cell Structure, Microscopy, Magnification, Measurement .

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