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Date	May 2022	Marks available	1	Reference code	22M.1.SL.TZ2.2
Level	Standard level	Paper	Paper 1	Time zone	Time zone 2
Command term		Question number	2	Adapted from	N/A

Question

The images of the radiolarian, a single-celled marine organism, were produced using a light microscope (left) and a scanning electron microscope (right).

[Source: Munir,S.;Sun,J.;Morton, S.L. The First Record and Classification of Planktonic Radiolarian
(Phylum Retaria) and Phaeodarian (Phylum Cercozoa) in the Eastern Indian Ocean. Biology 2021, 10, 202.
https://doi.org/10.3390/biology10030202 Copyright: © 2021 by the authors. This article is an open access
article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).]

What is a reason for the difference in quality of these images?

A. Light cannot pass through the specimen.

B. Higher magnification can be achieved with the electron microscope.

C. The resolution of the electron microscope is higher.

D. Samples are stained with methylene blue when viewed with the light microscope.

Markscheme

Examiners report

The majority of students answered this correctly. The most common mistake was to answer that a higher magnification can be achieved with the electron microscope. This could not be determined from the images as both were at the same scale.

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Core » Topic 1: Cell biology » 1.2 Ultrastructure of cells

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