Sub-topic 1
2026 · National One-Eighth
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Ecological pyramids: pyramid of biomass
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Sub-topic 2
2026 · National One-Eighth
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Food chains: parasites and variable trophic level
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Sub-topic 3
2021 · National Preliminary
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Primary consumers, trophic level and biomass (true/false)
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Sub-topic 4
2023 · National Final
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The ten percent rule of energy transfer between trophic levels
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Sub-topic 5
2026 · National One-Eighth
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Riddle: the detritus food chain, less dependent on sunlight
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Sub-topic 6
2020 · National Preliminary
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Why the pyramid of energy is always upright
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Sub-topic 7
2023 · National Preliminary
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Identifying the producer at the base of a food chain (man-fish-zooplankton-plants)
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