Ijmb Model Questions Vol1 2023 Biology Question 1

Practice practical question 1 from the 2023 Ijmb Model Questions Vol1 Biology examination. This question covers Cell Structure .

Ijmb Model Questions Vol1 2023 Biology Practical

Topic: Cell Structure

Question 1 IJMB_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • practical

A prepared slide of an unknown eukaryotic tissue was examined under a light microscope equipped with an ocular micrometer calibrated at 0.5 µm per division. Five cells were randomly selected and the following measurements were recorded: | Cell | Cell diameter (µm) | Nucleus diameter (µm) | |------|--------------------|-----------------------| | 1 | 20 | 10.0 | | 2 | 22 | 11.0 | | 3 | 19 | 9.0 | | 4 | 21 | 10.5 | | 5 | 23 | 11.0 | No rigid cell wall was visible in any of the observed cells.

Question Parts

( a )

Calculate the mean cell diameter and the mean nucleus diameter (in µm).

( b )

For each cell, compute the nuclear‑cytoplasmic ratio (NCR) defined as nucleus diameter ÷ (cell diameter – nucleus diameter). Then determine the mean NCR for the five cells (expressed to two decimal places).

( c )

Using the mean NCR obtained and the observation that no cell wall was visible, infer whether the unknown tissue is of animal or plant origin. Justify your conclusion with two relevant points.

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About This Question

This is Ijmb Model Questions Vol1 2023 Biology Question 1. It is one of the practical questions from the 2023 Ijmb Model Questions Vol1 Biology examination.

The question covers Cell Structure .

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