DP Biology (first assessment 2025)

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Question 21M.1A.SL.TZ2.1

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.SL.TZ2.1
Level SL Paper 1A Time zone TZ2
Command term Question number 1 Adapted from N/A
1.
[Maximum mark: 1]
21M.1A.SL.TZ2.1

The diagrams represent cells with the same concentration of dissolved substances in their cytoplasm. If all the cells were placed in the same hypertonic sucrose solution, which cell would show the greatest rate of change in the concentration of its cytoplasm?

[1]

Markscheme

C

Examiners report

This question was taken from 1.1 (Introduction of cells) and required knowledge that the rate of change in the concentration of the cytoplasm would occur in the cell with the greatest surface area to volume ratio. The question did not discriminate well; many candidates chose the cell with the biggest volume and surface area (answer D) rather than the one with the largest surface area to volume ratio which would give the greatest rate of change.

Syllabus sections