Neco 2018 Biology Question 2

Practice practical question 2 from the 2018 Neco Biology examination. This question covers Cell Division .

Neco 2018 Biology Practical

Topic: Cell Division

Question 2 NECO • 2018 • BIOLOGY • practical

A sample of an onion (Allium cepa) root tip was collected, fixed in Carnoy's solution, stained with 2% aceto‑orcein, and a slide was prepared. Under a light microscope at 1000× magnification you examined 200 cells and recorded the number of cells in each stage of mitosis as shown below: Prophase: 40 cells Metaphase: 30 cells Anaphase: 20 cells Telophase: 10 cells Interphase: 100 cells Answer the following questions based on this data.

( a )

Calculate the mitotic index of the root tip sample.

( b )

Determine the percentage of cells observed in each of the five phases (Prophase, Metaphase, Anaphase, Telophase, Interphase).

( c )

Based on the mitotic index obtained, comment on the growth activity of the onion root tip.

( d )

Identify one possible source of error that could affect the accuracy of the mitotic index and suggest a precaution to minimise it.

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This is Neco 2018 Biology Question 2. It is one of the practical questions from the 2018 Neco Biology examination.

The question covers Cell Division .

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