Ijmb Model Questions Vol1 2021 Biology Question 1

Practice practical question 1 from the 2021 Ijmb Model Questions Vol1 Biology examination. This question covers Cell Structure, Microscopy, Cell Morphometry .

Ijmb Model Questions Vol1 2021 Biology Practical

Topics: Cell Structure Microscopy Cell Morphometry

Question 1 IJMB_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • practical

A prepared slide of human cheek epithelial cells is examined under a light microscope. The ocular micrometer has been calibrated with a stage micrometer so that one division equals 0.01 mm. At a total magnification of 400×, the average cell diameter measured from ten cells is 0.45 mm on the ocular scale.

Question Parts

( a )

Calculate the actual average cell diameter in micrometres (µm).

( b )

Assuming the cells are spherical, calculate the average cell volume (µm³) and surface area (µm²). Use π = 3.14.

( c )

Determine the surface‑area‑to‑volume ratio and comment briefly on its significance for diffusion across the cell membrane.

( d )

List two possible sources of error in the diameter measurement and suggest one way to minimise each error.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Ijmb Model Questions Vol1 2021 Biology Question 1. It is one of the practical questions from the 2021 Ijmb Model Questions Vol1 Biology examination.

The question covers Cell Structure, Microscopy, Cell Morphometry .

View More Ijmb Model Questions Vol1 2021 Biology Questions More Ijmb Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support