What is the ULTIMATE source of energy for almost all biological systems on Earth?
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Practise IGCSE 0610 questions in the style of recent Extended past papers, organised by syllabus subtopic. Each set comes with an examiner-style mark scheme and a downloadable worksheet.
Everything students ask about Cambridge IGCSE 0610 Energy flow Topical Past Papers.
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These Energy flow Topical Past Paper Questions are written in the style of recent Cambridge IGCSE Biology 0610 Extended papers and grouped by the Organisms and their environment (B19.1) section of the 2025–2027 syllabus. Use them to revise the exact skills examiners test in this part of the course.
Each question is graded Easy → Medium → Hard, plus an A★ Challenge for top-grade preparation. Tap a question to mark your own answer, then unlock the examiner-style mark scheme with model solutions and examiner tips. A printable Topical Past Papers worksheet is included so you can practise offline.
Identify the Sun as the principal source of energy input to biological systems. State that energy passes from organism to organism in food chains.
What is the ULTIMATE source of energy for almost all biological systems on Earth?
Explain how energy from the Sun enters biological systems.
[2 marks]How does energy then flow from plants to other living things?
Explain why energy is described as FLOWING through ecosystems rather than CYCLING (like nutrients do).
[3 marks]Which of the following groups occupies the FIRST trophic level in any food chain?
Roughly 90% of the energy is lost at each trophic level in a food chain. Suggest THREE specific ways this energy is 'lost'.
[3 marks]Explain why food chains rarely have more than 4 or 5 trophic levels.
[2 marks]Eating crops directly (e.g. wheat, rice) is more energy-efficient for feeding the human population than eating meat. Why?