The symbiotic relationship between beans and Rhizobium bacteria can be described as: Mutualistic: The Rhizobium fixes nitrogen for the plant to use and the plant provides the plant provides the Rhizobium with carbohydrates Saprophytic: The Rhizobium colonizes the dead roots of the Bean plant at the end of the growing season Parasitic: The Rhizobium colonizes the roots of the bean plant and fixes nitrogen, but causes nodules that stunt root growth Mutualistic: The bean plant fixes nitrogen that the Rhizobium needs for growth, and the Rhizobium provides protein for the plant.
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Free living Rhizobium have the ability to transform Nitrogen gas to ammonium ions. Rhizobium bacteria are also found inhabiting the roots of plants in the Legume family where Rhizobium uses carbohydrates synthesized by the plants. Which pair of terms most accurately describes the process, and, the relationship between Rhizobium and leguminous plants like alfalfa? Nitrogen fixation; mutualism Photosynthesis; mutualism Nitrogen fixation; parasitism Decomposition; mutualism
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The specific relationship between a legume and its mutualistic Rhizobium strain probably depends on (A) each legume having a chemical dialogue with a fungus. (B) each Rhizobium strain having a form of nitrogenase that works only in the appropriate legume host. (C) each legume being found where the soil has only the Rhizobium specific to that legume. (D) specific recognition between chemical signals and signal receptors of the Rhizobium strain and legume species.
In symbiotic nitrogen fixation by rhizobia and legumes a) the amount of nitrogen fixed is much greater than by non symbiotic organisms. b) neither the bacteria nor the legume can exist independently. c) the bacteria enter the leaves of the legume. d) the bacteria operate independently of the legume.
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