Waec Model Questions Vol1 2018 Biology Question 2

Practice practical question 2 from the 2018 Waec Model Questions Vol1 Biology examination. This question covers Cell Division .

Waec Model Questions Vol1 2018 Biology Practical

Topic: Cell Division

Question 2 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • practical

A root tip of an onion (Allium cepa) was harvested, fixed in Carnoy’s solution and a squash preparation was made for observation of mitotic figures under a compound microscope at 1000× magnification. From the slide, a total of 500 cells were examined and the following numbers of cells in each stage of mitosis were recorded:

Question Parts

( a )

Calculate the mitotic index (MI) as a percentage.

( b )

Which phase of mitosis is most frequently observed in the sample? Provide the percentage of cells in that phase.

( c )

Discuss what the obtained mitotic index indicates about the growth activity of the root tip.

( d )

Suggest one improvement to the preparation technique that could increase the reliability of the mitotic index determination.

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About This Question

This is Waec Model Questions Vol1 2018 Biology Question 2. It is one of the practical questions from the 2018 Waec Model Questions Vol1 Biology examination.

The question covers Cell Division .

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