Which is the correct sequence in a food chain?
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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 Food chains and food webs Topical Past Papers.
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These Food chains and food webs 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 (B19.2) 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.
Define producer, consumer, herbivore, carnivore, decomposer and trophic level. Construct and interpret food chains, food webs, pyramids of numbers, biomass and energy. Explain energy loss between trophic levels.
Which is the correct sequence in a food chain?
Define 'producer'.
[1 mark]Define 'decomposer'.
[1 mark]In a pyramid of NUMBERS, the producer is at the bottom and consumers stack above it. Why might a pyramid of numbers be INVERTED (top wider than bottom)?
Consider the food chain: grass → rabbit → fox.
Identify (i) the producer, (ii) the primary consumer, (iii) a secondary consumer.
[3 marks]If all the foxes were removed from the food chain in Q4, what would happen FIRST?
Explain the difference between a food CHAIN and a food WEB. Suggest why food webs give a more realistic picture of feeding relationships.
[3 marks]Consider a pyramid of BIOMASS for a food chain: grass → rabbits → foxes.
Explain why the biomass at each level decreases as you go UP the pyramid.
[3 marks]Why is a pyramid of ENERGY almost ALWAYS a true 'pyramid' (smaller higher up), even when a pyramid of biomass or numbers might be inverted?