DP Biology (first assessment 2025)

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Question 20N.1A.SL.TZ0.4

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.4
Level	SL	Paper	1A	Time zone	TZ0
Command term		Question number	4	Adapted from	N/A

4.

[Maximum mark: 1]

20N.1A.SL.TZ0.4

The diagram shows a section through a membrane. What are the modes of transport in the diagram?

[Source: © International Baccalaureate Organization 2020.]

[1]

Markscheme

C

Syllabus sections

B. Form and function » B2.1. Membranes and membrane transport » B2.1.3. Simple diffusion across membranes

B. Form and function » B2.1. Membranes and membrane transport » B2.1.6. Channel proteins for facilitated diffusion

B. Form and function » B2.1. Membranes and membrane transport » B2.1.7. Pump proteins for active transport

B. Form and function » B2.1. Membranes and membrane transport » B2.1.8. Selectivity in membrane permeability