Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 29.3, Problem 1CC
How do radioactive and stable isotopes differ? Design an experiment to determine whether or not denitrification is taking place in a soil ecosystem.
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The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Why would nitrogen-fixing plants be plowed under instead of harvested?
a) To increases usable nitrogen in the soil.
b) To increase water retention.
c) Nitrogen-fixing plants are not a food crop.
d) To decrease bacteria in the soil.
Organisms that damage crop plants are the most costly of introduced species. Weeds, pathogenic microbes, and arthropods that attack crops together account for half of the costs documented by Pimentel and his colleagues. What steps can we—farmers, governments, and all of us as a society—take to minimize the impacts of invasive species on crops?
The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Crop rotation would allow the farmer to reduce which of the following?
a) Planting seeds.
b) Watering the fields.
c) The use of manufactured fertilizer.
d) The burning of fossil fuels by farm equipment.
Chapter 29 Solutions
Prescott's Microbiology
Ch. 29.1 - What happens to the flow stream in fluorescence...Ch. 29.1 - Prob. 1CCCh. 29.1 - Prob. 2CCCh. 29.1 - Describe the rationale upon which the extinction...Ch. 29.1 - Prob. 4CCCh. 29.2 - Prob. 1MICh. 29.2 - Prob. 1CCCh. 29.2 - Prob. 2CCCh. 29.2 - Prob. 3CCCh. 29.2 - Prob. 4CC
Ch. 29.3 - How do radioactive and stable isotopes differ?...Ch. 29.3 - Prob. 2CCCh. 29.3 - Prob. 3CCCh. 29.3 - Prob. 4CCCh. 29.3 - What is the difference between MAR and MAR-FISH?...Ch. 29 - Prob. 1RCCh. 29 - Prob. 2RCCh. 29 - Prob. 3RCCh. 29 - Prob. 4RCCh. 29 - Prob. 5RCCh. 29 - Prob. 6RCCh. 29 - Prob. 7RCCh. 29 - Prob. 8RCCh. 29 - Prob. 9RCCh. 29 - Prob. 10RCCh. 29 - Prob. 11RCCh. 29 - How might you attempt to grow in the laboratory a...Ch. 29 - Both acetate and CO2 can be used by methanogenic...Ch. 29 - Prob. 3AL
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Corn undergoes C4 photosynthesis and does not fix nitrogen, whereas Alfalfa is a nitrogen-fixing plant that utilizes C3 photosynthesis. Both species are equally watered. What can you interpret from this dN/dt vs. N plot given the biculture and monoculture treatments for each species (alfalfa & corn)? Biculture: Both corn & alfalfa grown together in the same pot Monoculture: Corn & alfalfa grown in separate potsarrow_forwardThe practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Why would nitrogen-fixing plants be plowed under instead of harvested? * To increase water retention. Nitrogen-fixing plants are not a food crop. To increases usable nitrogen in the soil. To decrease bacteria in the soil.arrow_forwardSoil microorganisms, collectively referred to as dizotrophs, fix 90% of the inert nitrogen gas to ammonium and nitrate. There are two-main types of nitrogen-fixing bacteria: free-living (nonsymbiotic) and mutualistic (symbiotic). Describe the mutualistic relationship between Rhizobium and legumes. What is the advantage of using legumes as a cover crop in agricultural systems? A point of interest is that the nitrogenase enzyme complex is highly sensitive to oxygen. This is a major problem for free-living aerobic species such as cyanobacteria and species of the genera Azotobacter and Beiigrinckia. Describe two ways the bacteria can overcome to levels of oxygen in their cells.arrow_forward
- The practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Which of the following is not an abiotic factor that affects plants being used in crop rotation? a) NH3 availability b) Soil temperature c) Herbivore density d) Oxygen concentrationarrow_forwardDoes soil survey compose all the valuable data needed for the study in resource conservation?arrow_forwardIn another experiment, fishes were placed in separate aquarium tanks with water coming from three different waterways in Los Baños. Three tanks were filled with water from each source and equal number of fish were placed in each tank. The tanks were refilled as required with water from the original sources. Two plant species known to be bioremediators were tested and compared with a control (no plants). Three tanks were assigned to each of the plant species and the control. After three months, a sample of fish was taken from each tank and evaluated whether the fish contains heavy metals above the threshhold(1) and 0, otherwise. Which is the most appropriate procedure to compare the plant species and the control? A. F-test B. t-test C. Cochran’s Q D. Friedman testarrow_forward
- If only one half of the flora in the world existed in 2110 (perhaps due to deforestation), what do you predict the atmospheric carbon level would be ? How would you change the simulation to reflect this? What is the relationship between increased carbon in the ocean and increased carbon in the soil? How else might carbon be transferred to soil? Using the data generated by the simulation, determine the mathematical relationship between the percentage increase in fossil fuel consumption and the increase in atmospheric carbon. Is the relationship linear?arrow_forwardTrace the route of the nutrients NH,", NO, and PO,² carried by river runoff to a seagrass ecosystem. Indicate the specific process involved (e.g., nitrification, denitrification, etc.) and the chemical form (e.g., NH,", NO,", etc) at each step of transformation. Write your (short) answers in the numbered blanks below each illustration.arrow_forwardIdentify the five ways that poor agriculture practices degrade our soils. Give typing answer with explanation and conclusionarrow_forward
- What contents do agree that substitution possibilities use for natural life support function in environmental services?arrow_forwardwhat is mutualism? mention any two example where the organisms involved are commercially exploited in modern agriculture.arrow_forwardTrace the route of the nutrients PO43- carried by river runoff to a seagrass ecosystem. Indicate the specific process involved (e.g., nitrification, denitrification, etc.) and the chemical form at each step of transformation. You may use the illustration below or you can draw your own. Use arrows to show the routearrow_forward
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