Sub-topic 1
2026 · National Quarterfinal
Free
Keystone species: disproportionate effect on ecosystem structure
Read past contest →
Sub-topic 2
2026 · National Preliminary
Premium
Identifying ecological relationships between paired organisms
Read past contest →
Sub-topic 3
2024 · National One-Eighth
Premium
Riddle: epiphytes
Read past contest →
Sub-topic 4
2023 · National Preliminary
Premium
Adaptive benefits of gut-parasite features: flat body, egg number, anaerobic respiration
Read past contest →
Sub-topic 5
2012 · National Preliminary
Premium
Mycorrhizal symbiosis between fungi and plant roots
Read past contest →
Sub-topic 6
2012 · National Preliminary
Premium
Lichen as a symbiosis of fungi and algae or cyanobacteria
Read past contest →
Sub-topic 7
2021 · National Preliminary
Premium
Epiphytes in the rainforest compete for light
Read past contest →
Sub-topic 8
2023 · National One-Eighth
Premium
A holoepiphyte completes its life cycle without touching the ground
Read past contest →
Sub-topic 9
2023 · National One-Eighth
Premium
A hemiepiphyte later reaches the ground with descending roots
Read past contest →
Sub-topic 10
2023 · National One-Eighth
Premium
A protoepiphyte depends heavily on its host with minimal structural adaptation
Read past contest →