Carbon and Phosphorus Cycles — Prelims Questions

Which of the following statements correctly describes the primary difference between the carbon cycle and the phosphorus cycle?

Which of the following human activities is primarily responsible for the increased atmospheric $CO_2$ levels contributing to global warming?

Which of the following is the largest natural reservoir of phosphorus on Earth?

Eutrophication in aquatic ecosystems is primarily caused by the excessive input of which two nutrients?

Which of the following processes removes carbon from the atmosphere and incorporates it into organic compounds?

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