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- Soil 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.A group of researchers wanted to determine how leaf herbivory and seed production of a legume plant (legumes are a family of plants which includes beans and lentils) were affected by the presence of its mutualistic rhizobia (a group of nitrogen-fixing bacteria). They designed an experiment with two treatments: (1) rhizobia absent and herbivores present and (2) rhizobia present and herbivores present. Provide two additional treatments and briefly explain how they would contribute to our understanding of the results of this experiment.Which of the following explains why pea plants in high soil nitrogen conditions have so few rhizobial nodules on their roots? When there is already high soil nitrogen there is a very large cost to having rhizobial nodules. The rhizobia bacteria in the nodules fix nitrogen when there isn't enough in the soil, so when there is already high soil nitrogen there is no advantage for the pea plant to expend the extra energy housing the rhizobia. The rhizobia bacteria in the nodules use nitrogen when there isn't enough in the soil, so in conditions of high soil nitrogen the plant tries to exclude the rhizobia to keep the nitrogen for itself. When there is already high soil nitrogen there is no benefit to the plant to having rhizobial nodules, which can rob the plant of the high nitrogen supplies so that the rhizobia bacteria do not have to fix the nitrogen themselves.
- Many plants that produce nodules for nitrogen-fixing bacteria are common on disturbed sites. Explain how these plants might simultaneously compete with and facilitate other plant species.A corn farmer has approached you with various leaf samples with symptoms shown as below. Identify missing nutrients of a, b, e, and d based on Figure 1 below. (i) (a) Pioneer Seeds Australia Croplife (c) (d) https://agcrops.osu.edu/ IPNI Figure 1: Nutrient deficiency symptoms of corn Where would you expect to find symptoms of nutrient deficiency for mobile and immobile nutrients? Also, detemine the mobility of missing nutrients identified in Question 2 b) (i). (ii)Why do nitrogen-fixing bacteria induce formation of root nodules?
- Define nitrogen fıxation and identify the key enzyme involved. Additionally explain how and why N fixing legumes minimize the concentration of O2 in the root nodulesyou have isolated a Bacillus species and would like to test its plant growth promoting abilities. other than nitrogen fixation and ACC deaminase production, discuss three other traits that you would look for and their significance in promoting plant growth.Which of the following biofertilizer extends the root system's reach, allowing for enhanced water and nutrient absorption? Explain.a. Bio-N (Corn) [Azospirillum lipoferum and Azospirillum brasilense] b. Trichoderma [Trichoderma sp.]c. Mykovam [vesicular arbuscular mycorrhiza]
- The specific relationship between a legume and its mutualisticRhizobium strain probably depends on(A) each legume having a chemical dialogue with a fungus.(B) each Rhizobium strain having a form of nitrogenase thatworks only in the appropriate legume host.(C) each legume being found where the soil has only theRhizobium specific to that legume.(D) specific recognition between chemical signals and signalreceptors of the Rhizobium strain and legume species.Which of the following statements is/are TRUE for nitrogen fixation? A. Process is performed by nitrifying soil bacteria. B. Performed by bacteria present in the roots of all plants. C. Reduction of N2 to NH3. D. Consumes a negligible amount of ATP.What is meant by legumes, and similar plants, “fixing “ nitrogen in soil?
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