Cambridge IGCSE Biology practice

Paper 3 structured question: Biotechnology

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Paper

Marks

Topic

Biotechnology

Exam-style question

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Paper 3Theory (Core)2 marks

Yeast is used in bread making to help the dough rise.

Description

Yeast respires anaerobically inside bread dough because oxygen is limited. This process produces energy, carbon dioxide, and ethanol.

a
Describe how anaerobic respiration in yeast helps bread to rise.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 3Theory (Core)1 marks

Description

Yeast breaks down sugars without oxygen to produce energy, carbon dioxide, and ethanol.

a
State one product of anaerobic respiration in yeast besides carbon dioxide.
Your answer
Aim for approximately 1 distinct marking point.
[1]