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1.3 Respiration

1.3 Respiration

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Question 3

An experiment is set up to compare respiration in yeast under different conditions using two insulated vacuum flasks:

  • Flask A contains a glucose solution and active yeast, with a layer of liquid paraffin poured on top of the mixture to exclude oxygen.
  • Flask B contains a glucose solution and active yeast, and is continuously aerated with oxygen.

Both flasks are fitted with thermometers to monitor temperature changes over several hours.

Which row in the table correctly describes the type of respiration occurring in each flask and the relative temperature rise at the end of the experiment?

RowRespiration in Flask ARespiration in Flask BTemperature rise
AAnaerobicAerobicFlask B is greater than Flask A
BAerobicAnaerobicFlask A is greater than Flask B
CAnaerobicAerobicFlask A is greater than Flask B
DAerobicAnaerobicFlask B is greater than Flask A
A

Row A

B

Row B

C

Row C

D

Row D

Markscheme

1.3 Respiration Questions

  1. GCSE
  2. /Biology
  3. /1.3 Respiration

16 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.

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