[Campbell Biology P.676] Based on Figure 29.14 and the provided text, what was the approxima... | Practice Question

Based on Figure 29.14 and the provided text, what was the approximate percentage reduction in nitrogen loss due to leaching when Polytrichum moss was present compared to its absence?

  • A: Approximately 94%.
  • B: Approximately 85%.
  • C: Approximately 5%.
  • D: Approximately 15%.

Explanation

According to the graph in Figure 29.14, the annual nitrogen loss due to leaching without moss is approximately 5.0 kg/ha. The text states that with Polytrichum moss, the nitrogen lost to leaching was 0.3 kg/ha. Therefore, the reduction in nitrogen loss due to leaching is 5.0 kg/ha - 0.3 kg/ha = 4.7 kg/ha. The percentage reduction is 4.7 kg/ha / 5.0 kg/ha 100% = 94%.