Question

Phosphorous Cycling in Ecosystems

a) Decomposition by de-nitrofying bacteria
b) Absorption by plant leaves from the atmosphere and photosynthesis
c) Absorption from the atmosphere by nitrogen-fixing bacteria
d) Uptake and assimilation by plant roots and through animals eating

Answer 1

The phosphorus cycle refers to the recycling of phosphorus in ecosystems, whereas the nitrogen cycle entails the transformation of nitrogen, including fixation and other processes, critical for ecosystem dynamics. Both cycles are essential for sustaining life and are affected by human activities.

Step-by-step explanation:

The phosphorus cycle is a biogeochemical cycle in which phosphorus is continuously recycled through biotic and abiotic components of ecosystems. Mechanisms by which phosphorus is released into the environment include rock weathering, decomposition of organic molecules, and volcanic activity. In contrast to the phosphorus cycle, the nitrogen cycle is a process that includes nitrogen fixation by microorganisms, which make atmospheric nitrogen available to plants, and further steps like ammonification, nitrification, and denitrification. Nitrogen cycling is critical as nitrogen is a limiting factor in most terrestrial ecosystems, influencing primary production and ecosystem dynamics. Furthermore, excessive use of nitrogen fertilizers can lead to environmental issues such as eutrophication, smog, and acid rain.