996 past contests
Topic 34 · The cork cambium (phellogen) and secondary growth
Topic 44 · Light intensity probes and their use across habitat types
Topic 3 · Amylase is present in both saliva and intestinal secretions
Topic 9 · Haversian canals are bone structures, not osteoblast-specific spaces
Topic 9 · Number of rib pairs directly attached to the human sternum
Topic 30 · The pouch as the distinguishing feature of marsupials
Topic 30 · Specialized hooves as the distinguishing feature of ungulates
Topic 1 · Riddle: the shell, across chemistry, botany and zoology
Topic 31 · Plants with stems modified for water storage
Topic 31 · Plants with leaves modified for climbing (tendrils)
Topic 13 · Pheromones: chemical signals for mate attraction and territory marking
Topic 3 · Hydroponics: growing plants in liquid nutrient culture without soil
Topic 46 · The ganglion: a mass of nervous tissue with synapses and cell bodies
Topic 8 · The sigmoid shape of a typical population/organism growth curve
Topic 22 · Protective coverings of mammalian organs (meninges, pericardium, pleura, tunica albuginea, periosteum, renal capsule)
Topic 8 · Why a seed imbibing water is not considered biological growth
Topic 22 · Melanin: skin pigmentation and uv protection
Topic 17 · The tonsils: lymphocyte production and immune defense
Topic 27 · Plasmodium species and the sexual/asexual stages of its life cycle
Topic 3 · Macronutrient deficiencies causing necrosis in leaf tissue