Nutrient Cycling — Prelims Questions

Which of the following bacterial genera is responsible for converting nitrites ($ext{NO}_2^-$) to nitrates ($ext{NO}_3^-$) in the nitrogen cycle?

Which of the following is NOT a major reservoir for the phosphorus cycle?

Which human activity is primarily responsible for the increased concentration of $ext{CO}_2$ in the atmosphere, leading to global warming?

Which of the following processes in the nitrogen cycle returns gaseous nitrogen ($ext{N}_2$) to the atmosphere?

Which of the following is a direct consequence of excessive phosphorus runoff into aquatic ecosystems?

Which of the following statements about the sulfur cycle is INCORRECT?