Silvia_ ANSWERS to Review questons

Silvia_ ANSWERS to Review questons - Strawberries produced...

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Strawberries produced or g of strawberry produced time Silvia’s ANSWERS NOTE: These are answering GUIDELINES to help you study. They are NOT exhaustive, complete or the only possible answer (in some cases). If you have questions or something seems wrong, please email me at silviacr@ufl.edu - Everything should be in the powerpoints too. - Last thing: Don’t forget to look at the questions we included in each powerpoint! REVIEW QUESTIONS: Lecture 8-Energy and NPP Concepts: 1. Ecosystem Ecology 2. Pool 3. Flux 4. Inputs 5. Outputs 6. Ecological efficiency 7. Assimilation efficiency 8. Ingested and egested energy 9. Assimilated, excreted, and respired energy 10. Energy budget 11. Second law of thermodynamics 12. Gross Primary Production (GPP) 13. Net Primary Productivity (NPP) Questions: 1. From an energetic point of view, please explain why it would be more efficient to be a vegetarian than a meat eater. Because energy transfer between trophic levels is inefficient and the more levels there are the less energy that reaches the top. 2. Using your knowledge of energy flows across trophic levels, please answer the following question: If cattle are fed corn and a person eats only steak, how many kg of corn would be required to “build” a 60 kg person? How many kg of corn would it take to “build” a person that only eats corn? Explain. Please disregard all nutritional issues of eating only corn or steak. 6,000 g for the steak eater and 600 for the corn eater… Explain… 3. A Florida scrub jay eats around 6,000 acorns per year. Each acorn has a nutritional value of 0.1 kcal. For each acorn the scrub jay eats, he excretes an equivalent of 0.02 kcal. a) Which is the assimilated energy that the scrub jay obtains from acorns each year? 1
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b) What is the assimilation efficiency of acorns by the scrub jay? c) Is this efficiency typical of herbivores eating seeds yes/no? d) Would you predict that the assimilation efficiency would be higher for berries or for acorns? Why? Assimilation Efficiency: assimilated energy/ingested energy Assimilated energy = ingested energy-egested energy Ingested energy per year: 0.1x 6,000= 600 kcal/yr Egested energy per year: 0.02 x 6, 000 = 120 kcal/yr Assimilated energy: 480 kcal/yr Assimilated efficiency: 0.8 or 80% →typical of herbivores Berries, more nutritional values, less secondary compounds, fiber, and non-digestible products 4. (A)Which is the largest input of carbon to terrestrial ecosystems? (B)Who does it? (C) and where does the energy for this process come from? (A) Photosynthesis (B) plants and all autotrophs (C) light/sun 5. Rank these global carbon reservoirs in order from largest to smallest, with 1 as the largest and six as the smallest (5 points). ____Atmosphere
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This note was uploaded on 07/13/2011 for the course PCB 4034C taught by Professor Osenberg during the Spring '11 term at University of Florida.

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Silvia_ ANSWERS to Review questons - Strawberries produced...

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