Igcse Model Questions Vol1 2023 Biology Question 2

Practice practical question 2 from the 2023 Igcse Model Questions Vol1 Biology examination. This question covers Cell Division .

Igcse Model Questions Vol1 2023 Biology Practical
Topic: Cell Division
Question 2 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • practical

You are to investigate cell division in the root tip of an onion (Allium cepa) using a light microscope.

Question Parts

( a )
Outline the complete procedure for preparing a good onion root‑tip slide that will allow observation of the different stages of mitosis.
( b )
From five fields of view you obtained the following counts: | Field | Total cells | Prophase | Metaphase | Anaphase | Telophase | |-------|-------------|----------|-----------|----------|-----------| | 1 | 120 | 10 | 8 | 4 | 2 | | 2 | 110 | 9 | 7 | 3 | 1 | | 3 | 130 | 12 | 9 | 5 | 2 | | 4 | 115 | 8 | 6 | 4 | 1 | | 5 | 125 | 11 | 8 | 5 | 2 | Calculate: (i) The mitotic index (percentage of cells in any stage of mitosis). (ii) The percentage of cells in each individual stage (prophase, metaphase, anaphase, telophase). Show all working.

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About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 2. It is one of the practical questions from the 2023 Igcse Model Questions Vol1 Biology examination.

The question covers Cell Division .

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