ADAPTATIONS FOR GAINING RESOURCES IN LOW NUTRIENT ENVIRONMENTS Symbiotic relatio

Question

ADAPTATIONS FOR GAINING RESOURCES IN LOW NUTRIENT ENVIRONMENTS Symbiotic relationships with Nitrogen-fixing Bacteria: 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. Carnivorous Plants: Identify a cost to an insect species if they 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: 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. ADAPTATIONS FOR REPRODUCTION Attracting Pollinators: 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 D. Plant A is pollenated by flies, Plant B is pollenated by moths Sexual vs. Asexual reproduction:

Explanation / Answer

Q4) A- the roots of Sysbania are mostly underwater, and thus do not contain much of the N2. Stem nodules occur at the site of adventitious root primordia located on the stems via crack entry. Bacterias can live anywhere, in the ground, in the water or even in the air. Also the N2 is needed by the whole plant and not by a single part.

Q5) A-The insects would overpopulate the entire niche and would finally go extinct. When the insects learn to avoid the carnivorous plants, they would NO longer be eaten away and would die a natural death. In this matter their life expectancy would increase. Thus according to Darwin, their capacity to reproduce will also increase and thus they will OVERPOPULATE the niche. Due to overpopulation their will be scarcity of the resources and thus they'll die and would go extinct.

Q6) A- It provides a better access to the light in the canopy. As the Epiphytes mostly grow in the rainforests where the light doesn't reach the bottom, they need to depend on the supporting tree for higher altitude and thus get light. It provides access to sunlight in dense shaded forests.

Q7) NOT FULL IMFORMATION IS GIVEN. THE PLANT SPECIES IS NOT PROVIDED.

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