Biology · Oct / Nov 2020 · Paper 11 · Question 17

The diagram shows apparatus used to investigate respiration. [diagram: coloured oil drop, graduated scale, germinating peas, wire mesh, sodium hydroxide (to absorb carbon dioxide), water, thermometer] Which change will be seen and what is the explanation?

1. Aoil drop moves left — oxygen is used up by the peas
2. Boil drop does not move — oxygen is used up as fast as carbon dioxide is released
3. Coil drop does not move — carbon dioxide is absorbed
4. Doil drop moves right — peas release carbon dioxide

As printed in the paper