Combined Science 8464/2H June 2022

The exam paper addresses advanced biological concepts, including the water and carbon cycles, the impact of nitrate concentrations on plant growth, and water pollution. Topics cover hormonal regulation of blood glucose, human reproductive hormones, and cell division differences in meiosis and mitosis. Evolutionary and environmental sections analyze the Arctic habitat of polar bears, sea ice loss, and biodiversity. Practical applications focus on experimental design, data interpretation, and ecological relationships. Keywords: water cycle, carbon cycle, nitrate concentration, water pollution, blood glucose regulation, meiosis, mitosis, polar bears, Arctic habitat, biodiversity, hormonal control, experimental design.