Sub-topic 1
2025 · National One-Eighth
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Biological suffixes and taxonomic terms
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Sub-topic 2
2025 · National One-Eighth
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Biology career specializations (–ologist riddles)
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Sub-topic 3
2026 · National One-Eighth
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Relative sizes of plant pathogens
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Sub-topic 4
2021 · National Preliminary
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Acoelomate organisms
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Sub-topic 5
2024 · Regional Championship
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Historical figures credited as founders of a biological field
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Sub-topic 6
2024 · National Preliminary
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Riddle: vivisection, operating on a living animal for experimental purposes
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Sub-topic 7
2003 · National Semifinal
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Riddle: the shell, across chemistry, botany and zoology
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