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- Compare and contrast the production of a planttumor by Agrobacterium tumefaciens and a root noduleby a Rhizobium species. In what ways are thesestructures similar? In what ways are they different?Of what importance are plasmids to the developmentof both structures?Give 5 difficiency symptoms of Nitrogen and Phosphorus in plants.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.
- 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?Name bacteria a, b and c. How do plants obtain their nitrogen? How do animals obtain their nitrogen? Name two plants that have nodules on their roots. Name the three ways atmospheric nitrogen can be changed to nitrates. Why do all livings things need nitrogen? In what type of environmental conditions do bacteria B thrive in?(i) what are the juvinile hormoes that soluble in water. (ii) Explain the process of extraction of echinolone from echinacea plant (not about the cultivation and harvesting of echinacea) by using biological mechanisms. (iii) Is Echinolone water soluble. if yes, or No why.
- Evidence indicating the chloroplasts were originally free-living prokaryotes that subsequently evolved a symbiotic relationship with a eukaryotic host includes all of the following except: Ability of chloroplasts to synthesize all their own proteins Presence of circular DNA in chloroplasts and in free-living prokaryotes Similarities of rRNA sequences between chloroplasts and free-living prokaryotes Similarities of structures between chloroplasts and some contemporary free-living prokaryotes CTo determine: The reason that parasitism evolved repeatedly in photosynthetic plants.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.
- Describe what cellular structures must be present in a Euglena if they are able to feed both heterotrophically and autotrophically.Describe the process of host: bacteria recognition, attachment and infection for Rhizobium and legumes. What does the Rhizobium gain from association with the plant? What does the plant gain?Advantages and disadvantages of rhizobacteria in plants and agriculture.