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Review+Questions+-+3

Review+Questions+-+3 - Soil Science 10 Fall 2010 REVIEW...

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Soil Science 10 Fall 2010 REVIEW QUESTIONS # 3 1. What important roles do soil macro animals play in soil systems? (T14) 2. What roles do soil micro organisms play in the soil? Are all these roles beneficial? (T14) 3. What is the difference between a heterotroph and an autotroph? What is the difference between anaerobic, aerobic, and facultative bacteria? (T14) 4. What is a symbiotic relationship? (T14) 5. Why are plants willing to give up photosynthate (food) to mycorrhizae that infect their roots? (T14) 6. What are the optimum conditions of temperature, moisture, oxygen, pH, exchangeable Ca, and C/N ratio for organic matter decomposition by aerobic bacteria? (T14) 7. What is nitrogen fixation? What is denitrification? What types of organisms are responsible for these processes? (T14) 8. What is an essential plant nutrient? Can a plant grow at all if it is missing a particular essential nutrient? (T15) 9. How many essential elements are required by most plants? What is ultimate source of each nutrient?
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