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- How do the nitrogen-fixing genera Azospirillum and Rhizobium associate with plant roots? Rhizobium stays on the outside of the roots of tropical grasses, while Azospirillum grows inside the roots of legumes. Azospirillum and Rhizobium both stay on the outside of roots. Azospirillum stays on the outside of the roots of tropical grasses, while Rhizobium grows inside the roots of legumes. Azospirillum and Rhizobium both grow inside specialized root cells.Net primary production is equal to gross primary production minus what? the energy contained in bark and roots the energy used by autotrophs in respiration the energy fixed by photosynthesis solar energy the energy contained in leavesUnder similar environmental condition and considering the ultimate role of stomata in transpiration, which of the following plant species will likely release the largest amount of water vapor in the atmosphere? Plant Species II Plant Species III Plant Species I Plant Species IV
- If it were possible to increase nitrogen transport from rhizobia in root nodules to any part of soybean plants, what implications would this have for agriculture and food?Coffee (Coffea arabica) and Chocolate (Theobroma cacao) are two species of tropical or sub-tropical understory trees that have a rich history in human cultures. Given your knowledge about the plants, and considering the three main pillars of sustainability (environmental quality, economic vitality, and social justice), discuss important considerations for ensuring that coffee and chocolate production can be sustainable for the present and into the future. What are some of the most important considerations? Propose some specific recommendations to increase the sustainability of our relationships with these plant species. Make sure to address all three pillars of sustainability in your answer.Why is the Nitrogen content of Fertilizers so important?
- 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.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.What is the fundamental difference between energy flow and nutrient flux
- Plant growth is limited by available nitrogen. Why is nitrogen fixation a limiting factor? There is very little nitrogen available after fossil fuel combustion utilizes the available nitrogen. Nitrogen must be produced by bacteria due to the inability of recycling by decomposers. There is no nitrogen in the atmosphere; it is only found in aquatic biomes. The stability of nitrogen gas makes it difficult to turn into nitrogen for living things.Why are nutrient cycles in nature called biogeochemical cycles?What controls the partitioning of carbon between growth and repiration? and Why the efficiency of converting sugars into new biomass is relatively constant?