Plant root nodules are A. formed from gall-rotting bacteria that decompose plant roots. B. harmful to plants, because the bacteria outcompete the plants for nutrients. C.sites where nitrogen fixation occurs. D. structures created by fungi and are found in all agricultural crops.
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- 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.Root nodules contain ________ , which can _____________ .a. Azotobacter, fix N2b. Nitrosomonas, nitrify NH3-c. rhizobia, fix N2d. Bacillus, denitrify NO3_The nutrition of some plants is enhanced by a mutually beneficial association between a root and a fungus. The association is known as _________. a. root nodule c. root hair b. mycorrhiza d. hypha
- 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.Through mycorrhization, a plant obtains important nutrients such as ________. a. phosphorus, zinc, and copper b. phosphorus, zinc, and calcium c. nickel, calcium, and zinc d. all of the aboveHow do plants acquire carbon to build carbohydrates and lignin? Select one: O a. Through the stomata from the atmosphere O b. Through the roots, dissolved in soil water c. Through the root symbiosis with mycorrhizae O d. Through the root symbiosis with Rhizobia e. From the organic matter in the soil
- The following figure depicts the outline of a large fairy ring that has appeared overnight in an open meadow, as viewed from above. The fairy ring represents the furthest advance of this mycelium through the soil. Locations A-D are all 0.5 metres below the soil surface. A В D 1. Which type of organisms made this structure (it wasn't a fairy!)? What is mycelium? Explain in one sentence each. 2. Which location (A-D) most likely indicates the oldest part of this organism? Explain in 1-2 sentences.what process can give plants an advantage because of the presence of these bacteria undergoing the following process can provide them with nitrogen for the production of protein? A. nitrifying B. denitrifying C. ammonification D. nirtogen fixingThe rhizosphere is:Group of answer choices A.) an area 1-2 mm in thickness adjacent to the root. B.) Bacteria that assists in the conversion nitrogen gas. C. ) Fungi that assists in the absorption of micronutrients. D.) All of the above
- Soil pH affects availability of nutrients for root absorption. The following statements are true except* a. Low pH results in an increase in Aluminum toxicity. b. Low pH results to unavailability of major nutrient elements. c. Toxic metals are more available in acidic soil. d. Low pH results in slow activity of soil-inhabiting microorganisms....means degrading/removing environmental poisons or pollutants by microorganisms such as fungiThe figure depicts the outline of a large fairy ring that has appeared overnight in an open meadow, as viewed from above. The fairy ring represents the furthest advance of this mycelium through the soil. Locations A-D are all 0.5 meters below the soil surface. A B. Where would you expect to find the oldest portion of this mycelium? location A location B location C location D DO00
