Cambridge IGCSE Combined Science practice

Paper 3 structured question: Energy flow

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

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Paper

Marks

Topic

Energy flow

Exam-style question

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Paper 3Theory (Core)3 marks

Energy flow in ecosystems is essential for understanding ecological relationships.

Description

Energy from the Sun is captured by plants and transferred through various trophic levels in an ecosystem.

a
Explain how energy is transferred from the Sun to herbivores in an ecosystem.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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Paper 3Theory (Core)3 marks

Description

As energy moves through an ecosystem, a significant amount is lost at each trophic level.

a
Discuss the reasons why energy is lost as it moves through a food chain.
Your answer
Aim for approximately 3 distinct marking points.
[3]