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Date May 2011 Marks available 1 Reference code 11M.1.HL.TZ1.10
Level Higher level Paper Paper 1 Time zone Time zone 1
Command term Question number 10 Adapted from N/A

Question

What is the source of the oxygen released into the air as a product of photosynthesis?

A. Chlorophyll
B. Carbon dioxide only
C. Water only
D. Both water and carbon dioxide

Markscheme

C

Examiners report

While this question was a good discriminator and was answered correctly by the more able candidates, it was worrying that so many incorrectly chose D. The weaker candidates answered that both water and carbon dioxide are sources of the oxygen produced by photosynthesis indicating that this had not been taught thoroughly.  

Syllabus sections

Core » Topic 2: Molecular biology » 2.9 Photosynthesis
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