Which of the following items is most sensitive to increased acidity in the environment?

1. Which of the following biogeochemical cycles can be influenced by human activity and cause eutrophication?

• 1. Which of the following biogeochemical cycles can be influenced by human activity and cause eutrophication of a local water supply? (Points : 3) nitrogen cycle carbon cycle oxygen cycle water cycle 2. Bacteria convert atmospheric nitrogen to which of the following in the process of nitrogen fixation? (Points : 3) ammonia phosphorus nitrogen gas nitric acid 3. The burning of fossil fuels releases which of the following gases into the atmosphere? (Points : 3) carbon dioxide nitrate oxygen nitrogen 4. What role do decomposers play in the cycling of material in a biogeochemical cycle? (Points : 3) Decomposers incorporate some organic compounds into their bodies and release some back to the environment as waste. Decomposers break down organisms to supply the soil, water, and air with inorganic chemicals. Decomposers use nonliving processes such as rain and fire to make inorganic chemicals. Decomposers make chemicals from the nonliving environment into organic compounds. 5. During which of the following steps of the water cycle is water changed from a vapor state to a liquid state? (Points : 3) condensation precipitation evaporation transpiration 6. What impact can deforestation have on the water cycle? (Points : 3) Carbon dioxide is released into the air as trees are burned. Photosynthesis increases, thereby increasing the amount of carbon dioxide in the air. Transpiration declines. The amount of nitrogen-fixing bacteria increases. 7. Carbon dioxide enters the atmosphere through each of the following processes except one. Which one? (Points : 3) photosynthesis respiration burning fossil fuels volcanic eruptions 8. The use of fossil fuels is a concern because it can lead to which of the following? (Points : 3) eutrophication increased runoff global warming polluted waters 9. A farmer has concerns about the nitrogen levels in her soils. What can she do to ensure that the nitrogen bacteria are replenished in the soil? (Points : 3) Plant a crop of legumes, such as clover or alfalfa. Plant a crop of mushrooms to speed up decomposition. Clear cut the area surrounding the field. Plant more plants to increase transpiration. 10. Where is the largest reservoir of carbon on earth located? (Points : 3) on land in freshwater in the oceans in the stratosphere only 11. Marine organisms have carbon in their bodies in which of the following forms? (Points : 3) carbon monoxide bicarbonate pure carbon calcium carbonate 12. Carbon in the bodies of marine organisms is often found in which of the following forms? (Points : 3) clastic sedimentary rock layered sedimentary rock chemical sedimentary rock igneous rock 13. Which of the following is the source of energy for the water cycle? (Points : 3) the sun gravity winds volcanic eruptions 14. Which of the following statements about the water cycle is true? (Points : 3) Organisms in the biosphere do not influence the water cycle. The water cycle only continues during daylight hours. Plants play a vital role in the water cycle. Precipitation that falls to the ground ends up only as groundwater. 15. Why is nitrogen fixation such an important step in the nitrogen cycle? (Points : 3) Decomposers need to use NH4+. Bacteria convert the fixed nitrogen back into N2. Soil nitrogen is different. Plants can’t use nitrogen in the form of N2. 16. How does deforestation affect the water cycle? (Points : 3) It can alter precipitation patterns. It increases the amount of transpiration. It leads to an increase in eutrophication. It reduces the amount of carbon dioxide in the atmosphere. 17. The carbon cycle works in conjunction with which of the following? (Points : 3) all biogeochemical cycles water cycle nitrogen cycle cycling of oxygen

• Answer:

  1) Nitrogen Cycle, through fertilizers by farmers. 2) Nitric Acid 3) Carbon Dioxide 4) #1answer 5) Condensation 6) transpiration declines 7) respiration 8) Global Warming 9) Plant Alfalfa 10) stratosphere 11) calcium carbonate 12) chemical rock 13) gravity 14) Plants play a vital role 15) Plants can't use nitrogen in the form of N2 16) It can alter precipitation patterns 17) cycling of oxygen