DP Biology (first assessment 2025)

Question 22M.1A.SL.TZ1.12

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1A.SL.TZ1.12
Level	SL	Paper	1A	Time zone	TZ1
Command term		Question number	12	Adapted from	N/A

12.

[Maximum mark: 1]

22M.1A.SL.TZ1.12

The graph shows how the rate of photosynthesis of a green plant varies with CO₂ concentration at two different light intensities. The temperature is kept constant at 20 °C.

What is the limiting factor at X?

A. Chlorophyll

B. Light intensity

C. Temperature

D. CO₂ concentration

[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.TZ1.12

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