# 1pilihanWhat are the gases involved in the principle of BioUrban?Methane and Carbon dioxideCarbon dioxide and OxygenNitrogen and OxygenHydrogen and Carbon dioxide
# 2pilihanWhich metabolic process allows algae in biocurtains to convert carbon dioxide into oxygen?GlycolysisPhotosynthesisNitrogen fixationFermentation
# 3pilihanIn algae-based air purification systems, which byproduct of photosynthesis contributes to air purification?HydrogenMethaneOxygenCarbon dioxide
# 4pilihanIn the context of algae-based air purifiers, what does the term "photobioreactor" refer to?A device that uses light to break down pollutantsA system that cultivates algae for biofuel productionA reactor that uses algae and light to capture CO₂ and release O₂A chamber where algae are genetically modified