DP Biology (first assessment 2025)

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Question 21M.1A.SL.TZ2.27

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.SL.TZ2.27
Level SL Paper 1A Time zone TZ2
Command term Question number 27 Adapted from N/A
27.
[Maximum mark: 1]
21M.1A.SL.TZ2.27

Which is an adaptation to increase rates of gas exchange in the lung?

A. Small surface area

B. Dry surface

C. High vascularization

D. Muscular alveoli

[1]

Markscheme

C

Examiners report

Some centres expressed concern that the term vascularization might be difficult for the candidates. However, they may have heard the term when referring to the cardiovascular system. Although it is not the recommended way to arrive at correct responses, the candidates could have arrived at the correct solution by eliminating the other three responses which are obviously incorrect.

Syllabus sections