Rhizobium bacteria normally inhabit the soil. Suggest why nodules are found on t

Question

Rhizobium bacteria normally inhabit the soil. Suggest why nodules are found on the stems of Sesbania? A. The roots of the Sesbania are often underwater or in flooded soils that do not contain much N_2. B. Bacteria live best above the ground. C. Sesbania only use the nitrogen in the upper portion of the plant so they do not need to make nodules on their roots. D. Bacteria will drown under water. Identify a cost to an insect species if the)' evolved a behavioral avoidance to carnivorous plant characteristics? A. The cost to insects would be they would overpopulate the niche and go extinct. B. If the insects evolved to avoid a potential food source they would reduce their fitness. C. If the insects did not go to the carnivorous plants, they would die out. D. There is no cost to insects if they evolve to avoid carnivorous plant characteristics. Epiphytes have adapted to grow without soil in the canopy layer in a tropical rainforest. What is the major environmental factor that is overcome by growing in this location and not on the forest floor? A. Better access to light in the canopy. B. Better access to soil in the canopy. C. Better access to water in the canopy. D. Safer from herbivory in the canopy. Compare flower shape and color of these two species of flowering plants and using the information provided, suggest what type of animals are most likely to pollinate them. A. Plant A is pollenated by bees. Plant B is pollenated by birds B. Plant A is pollenated by birds. Plant B is pollenated by bees C. Plant A Is pollenated by moths. Plant B is pollenated by flies Plant A is pollenated by flies. Plant B is pollenated by moths

Explanation / Answer

4.a.Sesbania rostrata is a small semi-aquatic leguminous tree, in the genus Sesbania. It forms a symbiotic relationship with Gram-negative rhizobia which leads to the formation of nitrogen fixing nodules on both stem and roots. It is mainly used as green manure to improve soil fertility due to its fast growth, high biomass production and ability to convert large amounts of atmospheric nitrogen into a usable form for plants.

5.b.

6.a.While light is more plentiful in this niche, access to water and nutrients can be limited. Epiphytes haveno contact with the soil,

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