Ijmb Model Questions Vol1 2018 Biology Question 1

Practice practical question 1 from the 2018 Ijmb Model Questions Vol1 Biology examination. This question covers Cell Structure, Microscopy, Cell Geometry .

Ijmb Model Questions Vol1 2018 Biology Practical

Topics: Cell Structure Microscopy Cell Geometry

Question 1 IJMB_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • practical

You are given a prepared slide of onion (Allium cepa) epidermal cells and an ocular micrometer that has been calibrated as 100 divisions = 0.5 mm. Using the microscope you measure the length of a typical cell as 45 divisions and its width as 30 divisions. The average thickness of the cell (measured from a different preparation) is 0.02 mm. Answer the following:

Question Parts

( a )

Convert the observed divisions to the actual length and width of the cell in millimetres.

( b )

Assuming the cell is a rectangular prism of thickness 0.02 mm, calculate its volume in mm³.

( c )

Calculate the total external surface area of the cell (excluding the cell wall thickness) in mm².

( d )

Determine the surface‑area‑to‑volume (SA:V) ratio and briefly discuss how this ratio influences the rate of diffusion of nutrients into the cell.

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About This Question

This is Ijmb Model Questions Vol1 2018 Biology Question 1. It is one of the practical questions from the 2018 Ijmb Model Questions Vol1 Biology examination.

The question covers Cell Structure, Microscopy, Cell Geometry .

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