996 past contests
Topic 25 · True or false: amphibians and algae both exhibit external fertilization
Topic 33 · True or false: kidney-damage anemia occurs because red blood cells pass through the glomerulus
Topic 33 · True or false: kidney-damage anemia occurs because hemoglobin is not synthesized sufficiently
Topic 45 · True or false: stomata open via increasing the water potential in guard cells
Topic 45 · True or false: stomata open via weakening of guard cell walls, allowing them to stretch
Topic 4 · Problem of the day: the sequential steps of mammalian respiration, from ventilation to cellular utilization
Topic 45 · True or false: stomata open via decreased solute concentration in guard cells
Topic 33 · Adh (vasopressin) drives water reabsorption in the kidneys
Topic 24 · The fleshy part of a true fruit derives from the ovary wall
Topic 10 · Transduction: a virus transferring genetic material between bacteria
Topic 29 · The fluke causing schistosomiasis belongs to class trematoda
Topic 29 · The tapeworm causing teniasis belongs to class cestoda
Topic 29 · The fluke causing bilharzia belongs to class trematoda
Topic 29 · Riddle: stoneflies, an indicator species requiring clean, oxygenated water
Topic 24 · The edible part of a coconut is the endosperm
Topic 23 · The edible part of an apple is its thalamus (receptacle)
Topic 24 · The edible part of a banana is its mesocarp and endocarp
Topic 12 · True or false: removing microorganisms from a forest ecosystem would impair decomposition and photosynthesis
Topic 12 · True or false: removing microorganisms from a forest ecosystem would impair nutrient cycling and solar energy fixation
Topic 38 · True or false: removing microorganisms from a forest ecosystem would impair nitrogen fixation and decomposition