Directions: In a separate sheet of paper, choose and write the letter of the best answer. 1) Which of the following best describes soil as a nutrient cycler? a. Soil microorganisms convert unusable atmospheric nitrogen into nitrates that are used by plants in a process known as Nitrogen Fixation. b. When water and air pass through soil, contaminants are absorbed in the soil and degraded by soil microorganisms. c. Soil maintains plant and animal life by providing healthy ecosystems where they can thrive and reproduce. d. Human infrastructure relies on soil support for anchorage for long-term stability. 2) Which describes the filtration capacity of soil? a. Human infrastructure relies on soil support for anchorage for long-term stability. b. When water and air pass through soil, contaminants are absorbed in the soil and degraded by soil microorganisms. c. Soil maintains plant and animal life by providing healthy ecosystems where they can thrive and reproduce. d. Soil microorganisms convert unusable atmospheric nitrogen into nitrates that are used by plants in a process known as Nitrogen Fixation. 3) Which is a chemical indicator of soil quality? a. Bulk density b. Soil enzymes c. Soil pH d. Aggregate stability 4) What does field capacity indicate? a. Amount of minerals present in soil b. Number of aggregates the make up a soil sample c. Amount of moisture or water content held in soil after drainage d. Number of microorganisms thriving in soil 5) Which is the most dominant soil quality indicator? a. Particulate organic matter b. Earthworms c. Soil enzymes d. Total organic carbon​