Igcse Model Questions Vol1 2017 Biology Question 2

Practice practical question 2 from the 2017 Igcse Model Questions Vol1 Biology examination. This question covers Cell Division .

Igcse Model Questions Vol1 2017 Biology Practical

Topic: Cell Division

Question 2 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • practical

You are investigating the rate of cell division in the root tip of a fast‑growing bean (Phaseolus vulgaris). A 1 cm segment of the root tip is harvested, fixed, stained with aceto‑orcein and a slide is prepared. In a randomly selected field of view you count 200 cells and record the number of cells observed in each stage of mitosis as shown below. Prophase: 45 cells Metaphase: 30 cells Anaphase: 25 cells Telophase: 20 cells Interphase (non‑dividing): 80 cells

Question Parts

( a )

Calculate the mitotic index (percentage of cells in mitosis) for the observed field.

( b )

Determine the percentage of cells in each phase of mitosis.

( c )

Based on the percentages obtained, identify which phase is likely to be the rate‑limiting step of mitosis and give a brief explanation.

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About This Question

This is Igcse Model Questions Vol1 2017 Biology Question 2. It is one of the practical questions from the 2017 Igcse Model Questions Vol1 Biology examination.

The question covers Cell Division .

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