IAS · UNIT 3

Core Practical 5: Animal cells and measurements using a light microscope

Animal cells and measurements using a light microscope. 11 retrieval questions. Check each suggested answer after you try it.

Core Practical 5

11 questions in specification order0 of 11 rated0 secure

Question 1 of 11: A student measures a stomata as 8 eyepiece units using this calibration. Calculate its actual length and explain why the calibration cannot be reused at a different magnification.

01CP5Diagram

Core practical 5: light microscopy and scale

Practice question

Retrieval and explanation · suggested answer

A student measures a stomata as 8 eyepiece units using this calibration. Calculate its actual length and explain why the calibration cannot be reused at a different magnification.

The same two scales. A stomatal length measured as 8 units on eyepiece scale B must be converted using aligned micrometre scale A.
Upper scale in µm. Lower scale in eyepiece units.

Try this from memory first.