O-LevelBiologyRespiration5090/11 · Oct/Nov 2013 · Q331 Mark

The diagram shows an experiment to find out if seeds need oxygen to germinate. Which change would make tube Y an effective control?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AAdd soda lime (absorbs carbon dioxide) at the bottom of tube Y.

BClose tube Y with a rubber bung.

CDo not soak the seeds in tube Y.

DReplace the soaked seeds in tube Y with seeds that have been boiled.

✓ Correct answer

B: Close tube Y with a rubber bung.

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2013 Paper 1 Variant 1, question 33.

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