BIOLOGY (LL)
5th Edition
ISBN: 9781264115495
Author: BROOKER
Publisher: MCG
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Chapter 59, Problem 5TY
Summary Introduction
Introduction: The nitrogen cycle is an important biogeochemical cycle which comprises five major parts. The five major parts of the nitrogen cycle are nitrogen fixation, nitrification, assimilation, ammonification, and denitrification.
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Which of the following is a process of the nitrogen cycle that involves the conversion of nitrogen gas to ammonia?
a.Nitrogen fixation
b.Nitrification
c.Ammonification
d.Denitrification
Use of synthetic fertilizers often leads to the contamination of groundwater with nitrates. Nitrate pollution is also a suspected cause of anoxic "dead zones" in the ocean. Which of the following processes is most likely to help reduce nitrate pollution?
A. adding methanogens to the soil
B. adding nitrifying bacteria to the soil
C. adding denitrifying bacteria to the soil
D. using ammonia instead of nitrate as a fertilizer
Which statement offers the best explanation of how deforesting hubbard brooks watershed (W2) affected the nitrogen cycle?
1. Denitrification rates increased, resulting in a decrease in the export of ammonium
2. Microbial immobilization rates increased, resulting in a decline in stream nitrogen
3. Mineralization rates increased, causing the export of ammonium to increase
4. plant uptake nitrogen stopped, resulting in an increase in the export of nitrate
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- Figure 20.12 Which of the following statements about the nitrogen cycle is false? a. Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4+) . b. Denitrification by bacteria converts nitrates (NO3) to nitrogen gas (N2) . c. Nitrification by bacteria converts nitrates (NO3) to nitrites (NO2) . d. Nitrogen fixing bacteria convert nitrogen gas (N2) into organic compounds.arrow_forwardDefine the following terms:a. nitrogen fixationb. nitrogenasec. nitrogen assimilationd. amino acid poole. nitrogen cyclearrow_forwardDefine the following terms: a. nitrogen fixation b. MoFe protein c. Fe protein d. nitrogen assimilation e. dead zonearrow_forward
- In the context of the phosphorous cycle, which of the following processes is indicated by arrow ac? A. Erosion B. Convection C. Transpiration D. Evaporation E. Nitrogen fixationarrow_forwardWhat process brings nitrogen from the atmosphere into living system? A. Methanogenesis B. Denitrification C. Anammox D. Nitrogen fixation E. Nitrificationarrow_forwardWhat microbes is highest in agricultural lands? A. Aerobic nitrogen fixing bacteria B. Anaerobic nitrogen fixing bacteria C. Aerobic heterotrophic bacteria D. Anaerobic heterotrophic bacteriarrow_forward
- The process whereby nitrogen is brought into organic molecules is called ________. a. nitrification b. denitrification c. nitrogen fixation d. nitrogen cyclingarrow_forwardWhich of the following processes is/are used to fix atmospheric N2? a.bacterial action b.Haber process c.lightning d.transaminationarrow_forward1. Which processes remove nitrogen from the atmosphere? I. Fertilizer production II. Eutrophication III. Nitrogen fixation IV. Denitrification A. I and II B. I and III C. I and IV D. II and III Е. II and IV The net primary production (NPP) of a stable lake ecosystem is roughly equal to the amount of 2. A. phytoplankton present in the photic zone B. phytoplankton consumed by heterotrophs C. dissolved nutrients used by phytoplankton D. dissolved oxygen used by phytoplankton E. dissolved oxygen used by all consumersarrow_forward
- Give the importance of the a) water cycle b) nitrogen cyclearrow_forwardfertilizers are necessary if the soil lacks one of the following nutrients: a. calcium, carbon, potassium b. nitrogen phosphorus, potassium c. nitrogen, phosphorus, magnesium d. nitrogen, calcium, magnesium e. phosphorus, potassium, magnesiumarrow_forwardWhich nutrient moves into plants during primary production? a.phosphorus b. nitrogen c. carbon d. none e. all threearrow_forward
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