1) The process though which certain bacteria convert the atmospheric nitrogen into ammonium ions called______? a) Nitrogen Gas b) Nitrogen Fixation c) Acid 2) Nitrogen is assimilated/absorbed into plants in what from? a) Nitrite b) Ammonia c) Both (D) and (C) d) Nitrates 3) Only special bacteria can directly use nitrogen in our atmosphere and fix it so other organisms can benefit. These bacteria are called.......bacteria. a) Nitrogen making b) Nitrogen adjusting c) Nitrogen fixing d) Nitrogen assimilation 4) The Haber process refers to which biogeochemical cycle? a) Carbon b) Sulfur c) Nitrogen d) Water 5) The nitrogen cycle, one of the most important biochemical cycle, may cause environmental problems because too much nitrogen can: a) result in acid rain b) deplete the ozone layer c) Contribute to the greenhouse effect d) Cause eutrophication in bodies of water 6) What is the most common way that nitrogen fixation occurs? a) Lightning b) Nitrogen Fixing bacteria c) Fossil fuel combustion d) Forest fires 7) The process that converts nitrates back to nitrogen gas there by replenishing in the atmosphere is called...? a) Nitrifications b) Denitrification c) Nitrogen Fixation d) Deamination 8) The largest concentration of nitrogen is found in the______. a) Bacteria b) Animals c) Soil d) Atmosphere 9) Which statement below “best” describes the biogeochemical cycle in this figure? a) The movement of nitrogen between biotic and abiotic factors b) The removal of nitrogen from the atmosphere by lightning c) The use of nitrogen in making proteins d) The recycling if matter through respiration 10)  In__________ , some soil bacteria convert nitrogen compounds to nitrogen gas. In__________ , some soil bacteria convert nitrogen compounds to nitrogen gas.  a) Denitrification b) Nitrogen fixation c) Ammonification d) Nitrification 11) Around 78% of the atmosphere is nitrogen gas. Which of the following statements is CORRECT? Around 78% of the atmosphere is nitrogen gas. Which of the following statements is CORRECT?  a) Nitrogen gas dissolve in the soil to form nitrogen phosphate. b) Plants cannot use nitrogen gas directly from the air c) Plants can all form of nitrogen directly from the air, soil and water d) Plants can use nitrogen gas directly from the air

Nitrogen Cycle

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