CAIE A Level Biology 9700 · Energy and respiration

Energy and respiration: describe question

Describe5 marksStandard

A student investigated the effect of temperature on the rate of aerobic respiration in yeast using DCPIP as a redox indicator. Yeast suspensions were mixed with DCPIP at different temperatures and the time taken for the DCPIP to become colourless was recorded. The results are shown in the table.

Temperature / °CTime for DCPIP to become colourless / minutes
1018
2010
306
404
508
6012

Describe the effect of temperature on the time taken for DCPIP to become colourless.

0 words · 5 marks

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How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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