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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.Endomycorrhiza of forest trees contributes to the efficient nutrient cycling in tropical forest ecosystems. Reason.How do mycorrhizae function as biofertilisers? Explain with example.
- 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 optionsThe 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.Mycorrhizas represent associations between plant roots andmicroorganisms thata) are antagonistic.b) help plants take up phosphorus and other nutrients from soil.c) involve algae in the association with plant roots.d) form nodules on the plant’s leaves.e) lead to the production of antibiotics.
- Which species requires the least amount of nutrients in order to grow: Lemna polyrhiza or Lemna gibba? Lemna gibba O Lemna polyrhizaThe 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. Which type of organisms made this structure (it wasn't a fairy!)? What is mycelium? Explain in one sentence each. Which location (A-D) most likely indicates the oldest part of this organism? Explain in 1-2 sentences.Which of the following characteristics is NOT exhibited by phytochemicals? 1. reduce the risk of cataracts 2. inhibit activity of enzymes to activate carcinogens 3. reduce the risk of macular degeneration 4. act as antioxidants
- Why fine textured soil hold more water as compared to coarse textured soils?Black spot fungus is a disease that is known to attack roses in humid climates. At first, small black spots appear on the leaves. If left untreated, the entire plant can die. From this information, what is mostly the main cause of the demise? a) The plants’ cells are unable to carry out aerobic respiration. b) The leaves are unable to manufacture enough sugar to maintain the health of the plant. c) The roots are unable to absorb enough water. d) The stems are unable to support the plant.Which of the following statements are correct about nodule formation by Rhizobium species? P. Nodule formation requires participation of both plant's nodulin genes and rhizobial nodulation genes Q. Nod factors synthesized by nodulation genes are lipochitin oligosaccharides R. Infection thread forms during nodule formation is an internal tubular extension of the plasma membrane that is produced by the fusion of Golgi-derived membrane vesicles S. Nodule formation in non-leguminous plants is mainly mediated by Rhizobium species P and Q P. R and S F1 P, Q and R P, Q, R and S