DP Biology (first assessment 2025)

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Question 19M.2.HL.TZ1.a

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

Outline the functions of type I and type II pneumocytes.

[2]

Markscheme

type I:

a. carry out gas exchange
OR
diffusion of gases/CO2/O2 ✔

type II:

b. secrete fluid/surfactant ✔

Examiners report

Weak knowledge of pneumocytes from many candidates and whilst many showed an understanding of gas exchange they failed to articulate it properly using the correct phrasing and terminology.

Syllabus sections