Sub-topic 1
2026 · National One-Eighth
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Ecological pyramids
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Sub-topic 2
2024 · National Preliminary
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Ecological pyramids
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Sub-topic 3
2025 · National One-Eighth
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Social behaviour and organization in honeybee colonies
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Sub-topic 4
2026 · National Semifinal
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Disappearance of a bioindicator species as a sign of ecosystem disturbance
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Sub-topic 5
2026 · National Quarterfinal
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The stratosphere as the atmospheric layer containing the ozone layer
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Sub-topic 6
2018 · National Preliminary
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Litter production: which plant part contributes most
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Sub-topic 7
2024 · National One-Eighth
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Problem of the day: standard sampling methods for ecological population estimation
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Sub-topic 8
2026 · National Preliminary
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Identifying a branch/type of ecology (autecology, landscape ecology, synecology) from its focus
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Sub-topic 9
2023 · National Preliminary
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Riddle: ecology, the study of organism-environment interactions
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Sub-topic 10
2014 · National Quarterfinal
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Adaptation: modifications suiting an organism to its way of life
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Sub-topic 11
2014 · National Quarterfinal
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The biosphere: the region of earth where organisms exist
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Sub-topic 12
2014 · National Final
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Seasonal/resource limitations restricting some organisms to once-yearly reproduction
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Sub-topic 13
2020 · National One-Eighth
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Light availability as a factor influencing primary productivity
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Sub-topic 14
2020 · National One-Eighth
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Temperature as a factor influencing primary productivity
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Sub-topic 15
2020 · National One-Eighth
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Species composition as a factor influencing primary productivity
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Sub-topic 16
2023 · National Preliminary
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True or false: removing microorganisms from a forest ecosystem would impair nutrient cycling and solar energy fixation
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Sub-topic 17
2023 · National Preliminary
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True or false: removing microorganisms from a forest ecosystem would impair decomposition and photosynthesis
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Sub-topic 18
2023 · National Preliminary
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Riddle: ecology, the study of organism interactions named by ernst haeckel in 1866
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Sub-topic 19
2023 · National One-Eighth
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Vermicomposting uses earthworms to degrade organic waste
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Sub-topic 20
2023 · National Preliminary
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Riddle: an agroecosystem, the basic unit of agroecology
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