Cambridge IGCSE Biology practice

Paper 3 structured question: Biotechnology

Try the question first, then check the answer and practise the same topic again.

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Paper

Marks

Topic

Biotechnology

Exam-style question

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Paper 3Theory (Core)1 marks

During bread making, yeast respires anaerobically inside the dough.

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]

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Paper 3Theory (Core)2 marks

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]