DP Biology (first assessment 2025)

Question 19M.1B.SL.TZ1.a

Date	May 2019	Marks available	[Maximum mark: 2]	Reference code	19M.1B.SL.TZ1.a
Level	SL	Paper	1B	Time zone	TZ1
Command term	Calculate	Question number	a	Adapted from	N/A

[Maximum mark: 2]

19M.1B.SL.TZ1.a

Using the scale bar, calculate the magnification of the image.

[2]

Markscheme

$\frac{{{\text{scale bar length}}}}{{{\text{image size}}}} = \times 660$ ✔

Examiners report

Two marks were awarded for an answer within the given range, since many candidates did not show working, and the question did not request it. Many candidates measured the whole diagram for the numerator instead of the scale bar, and others inverted the formula. A formula in words that appeared correct was not credited if the numbers then negated this. Errors in unit conversion were frequent, but credit was given for working.

Syllabus sections

A. Unity and diversity » A2.2. Cell structure » A2.2.2. Microscopy skills

Question 19M.1B.SL.TZ1.a

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