DP Biology (first assessment 2025)

Question 22M.1A.SL.TZ2.12

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1A.SL.TZ2.12
Level	SL	Paper	1A	Time zone	TZ2
Command term		Question number	12	Adapted from	N/A

12.

[Maximum mark: 1]

22M.1A.SL.TZ2.12

The apparatus shown was used to investigate the effect of varying carbon dioxide concentration on the rate of photosynthesis. Carbon dioxide concentrations were varied by adding different amounts of sodium hydrogen carbonate (NaHCO₃) to water.

What is the dependent variable in this investigation?

A. Temperature

B. Light intensity

C. Amount of NaHCO₃ added

D. Volume of oxygen produced

[1]

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Syllabus sections

C. Interaction and interdependence » C1.3. Photosynthesis » C1.3.7. Techniques for varying concentrations of carbon dioxide, light intensity or temperature experimentally to investigate the effects of limiting factors on the rate of photosynthesis

Question 22M.1A.SL.TZ2.12

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