Ijmb Model Questions Vol1 2020 Biology Question 2

Practice practical question 2 from the 2020 Ijmb Model Questions Vol1 Biology examination. This question covers Cell Division .

Ijmb Model Questions Vol1 2020 Biology Practical
Topic: Cell Division
Question 2 IJMB_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • practical

A root tip of a young onion plant is harvested, fixed in Carnoy's solution and prepared as a squash slide for observation of mitosis under a microscope (100× oil immersion). While scanning the slide, the following counts are recorded from a total of 500 cells examined: - Prophase: 120 cells - Metaphase: 80 cells - Anaphase: 50 cells - Telophase: 30 cells - Interphase: 220 cells Answer the questions that follow.

Question Parts

( a )
Calculate the mitotic index (MI) of the root tip sample. Express your answer as a percentage to one decimal place.
( b )
Determine the percentage of cells in each of the five phases (prophase, metaphase, anaphase, telophase, interphase). Present the results in a table format, rounding to one decimal place.
( c )
Interpret the mitotic index obtained in (a). What does a MI of 56 % suggest about the growth activity of the root tip tissue?
( d )
List two precautions that should be observed during slide preparation to avoid artefacts that could affect the mitotic count.

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About This Question

This is Ijmb Model Questions Vol1 2020 Biology Question 2. It is one of the practical questions from the 2020 Ijmb Model Questions Vol1 Biology examination.

The question covers Cell Division .

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