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Edexcel IGCSE Biology 5.6 Yeast Anaerobic Respiration Questions

Practise yeast anaerobic respiration through gas collection, dough and ethanol data, temperature effects, indicators and percentage calculations.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • name CO2 and write the yeast equation showing glucose forming ethanol and CO2
  • describe gas syringe or measuring cylinder methods to measure gas volume per unit time
  • explain temperature effects using enzyme activity, optimum temperature and denaturation

Edexcel IGCSE Biology 5.6 Yeast Anaerobic Respiration Questions question 1

[Maximum number: 4]

A student investigates the effect of temperature on gas production in yeast.

The student uses this apparatus to count the number of gas bubbles produced per minute at different temperatures.

Figure for Question Edexcel IGCSE Biology 5.6 Yeast Anaerobic Respiration Questions question 1 — Edexcel IGCSE Biology

Question (a)

(a)

Name the process in yeast that produces the gas bubbles.

[ 1 ]

Question (b)

(b)

What gas is produced by the yeast?

A

carbon dioxide

B

nitrogen

C

oxygen

D

water vapour

[ 1 ]

Question (c)

(c)

Describe how the student should modify the investigation to obtain a more accurate measure of the optimum temperature.

[ 2 ]
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