Nitrogen-fixing bacteria on the roots of some plants can consume as much as 20% of the ATP produced by their host— consumption that does not seem very beneficial to the plant. Explain why this loss of valuable resources is tolerated and what the bacteria are doing with the ATP.
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Nitrogen-fixing bacteria on the roots of some plants can consume as much as 20% of the ATP produced by their host— consumption that does not seem very beneficial to the plant. Explain why this loss of valuable
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- 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.you 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.What is transpiration? Why is the use of transpiration? Write any three environmental factors that affect transpiration.
- Explain the consequences to the nitrogen gas in the atmosphere if all the nitrogen- fixation prokrayotes would die suddenly.Why is nitrogen fixation so energetically costly?One of the most widely known symbioses between microorganisms and plants is that of rhizobia and legumes. The basis of this mutualistic, symbiotic relationship can be described by which of the following statements? Actually, all of these are accurate descriptions of the symbiosis between rhizobia and plants. Rhizobia help the plants expand access to minerals in the soil while the plant protects the rhizobia from predators and viruses. The rhizobia will conduct photosynthesis which allow the plants to access carbon without having to deplete their own energy to do carbon fixation. The rhizobia fix nitrogen for the plant while the plant fixes carbon which it shares with the rhizobia. The rhizobia will produce oxygen which will help the soil to maintain oxygenation and thus avoid pathogens.
- 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?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.Describe the two metabolic pathways that plants use to assimilate N, whether the source is from symbiotic associations with rhizobial bacteria or from direct uptake of nitrate. Your answer must include the name of the primary enzyme involved in each metabolic pathway.
- The growth of plants requires microbes. Describe what microbes are most critical for soil-bound plants and how agriculture uses chemicals to support the growth of these microbes.An experiment was conducted to determine the deficiency symptoms of tomato plants placed in a hydroponic solution. Six bottles were prepared, and each bottle, except for the positive control, lacked a certain micronutrient. In the positive control, all nutrients were provided. Unexpectedly, the control setup still showed symptoms of micronutrient deficiency. It was then discovered that the relative humidity in the room was very high and transpiration was affected. Explain the appearance of these symptoms in the positive control set-up in lieu of the importance of transpiration? How will thermoregulation of tomato plants be affected if transpiration will not occur?Soil contains a number of habitats in which microorganisms thrive. What is the term given to the environment on the surface of the plant root? Rhizobium Rhizoplane Rhizopane Rhizopane None of the options