A-Level Edexcel Biology A2 Order-of-Magnitude Calculations

A-Level Edexcel Biology A2 Order-of-Magnitude Calculations
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Biology, Issue 2, February 2021Biology XBI11/YBI11

Review A-Level Edexcel Biology order-of-magnitude calculations through microscope images, scale bars, unit conversions and standard-form answers.

How this is tested

  • calculate magnification from microscope images using scale bars and unit conversions
  • give biological size or magnification answers in standard form or significant figures
  • work backwards from magnification to actual cell, organelle or tissue dimensions

Question 3(a)

[Maximum number: 1]

The topshell is a marine mollusc widely found on European coasts. It lives on rocky shores and is found in rock pools, on bare rocks and amongst seaweed. The photograph shows a group of topshells.

Figure for Question 3(a) — Edexcel A-Level Biology A2

Scale

Figure for Question 3(a) — Edexcel A-Level Biology A2

1 cm

Calculate the magnification of this photograph.