Neco 2024 Biology Question 2

Practice practical question 2 from the 2024 Neco Biology examination. This question covers Cell Division .

Neco 2024 Biology Practical

Topic: Cell Division

Question 2 NECO • 2024 • BIOLOGY • practical

You are to investigate mitosis in the root tip of an onion using a prepared slide.

Question Parts

( a )

Describe the procedure to prepare a fresh onion root tip slide for observing mitosis, including steps to obtain a good spread of cells.

( b )

Using the microscope, you count the number of cells in each phase of mitosis in 5 fields of view. The data obtained are: Prophase 12, Metaphase 8, Anaphase 5, Telophase 5, Interphase 70. Calculate (i) the mitotic index (percentage of cells in mitosis) and (ii) the percentage of cells in each mitotic phase relative to the total number of cells observed. Show all calculations.

( c )

Based on the percentages obtained, interpret which phase is most prolonged in the cell cycle and explain why this observation might occur.

( d )

Identify two factors that could affect the accuracy of the mitotic index obtained and propose how to control each factor.

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About This Question

This is Neco 2024 Biology Question 2. It is one of the practical questions from the 2024 Neco Biology examination.

The question covers Cell Division .

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