ecology - ECOLOGY QUESTION 1983: L. PETERSON/AP BIOLOGY...

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ECOLOGY QUESTION 1983: L. PETERSON/AP BIOLOGY Describe the trophic levels in a typical ecosystem. Discuss the flow of energy through the ecosystem, the relationship between the different trophic levels, and the factors that limit the number of trophic levels. STANDARDS: DESCRIPTION AND SYSTEM RELATIONSHIPS : Max. = 8 points Define and/or identify: __ producers __ consumers (herbivores - carnivores - omnivores) __ decomposers Identification of: __ autotrophs __ heterotrophs Define: __ trophic level __ Complex system Comparisons (Pyramids): __ organism (numbers) __ organism (size) __ organism (biomass) __ inverted, numbers and/or biomass __ Material Cycling __ Description of food chain and/or web ENERGY FLOW IN THE SYSTEM : Max. = 6 points __ source __ process (photosynthesis) __ producers support the system __ energy loss __ quantification of loss Use of Energy: __ heat __ metabolic __ building compounds __ amount of energy contained (comparative) Relationship of R: __ Pr net __ Pr gross LIMITING FACTORS : (No Max.) __ Energy (2 points) __ Change in Pr net __ Change in Pr gross __ Biomass (materials) __ Producer numbers __ Efficiency
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ECOLOGY QUESTION 1985: L. PETERSON/AP BIOLOGY Describe the process of ecological succession from a pioneer community to a climax community. Include in your answer a discussion of species diversity and interactions, accumulation of biomass, and energy flow. STANDARDS: DESCRIPTION __ Definition of Succession __ Differentiation (Primary/Secondary) Examples: __ Pioneer __ Climax __ Sere (two or more examples = 2 points) __ Modification of the environment SPECIES DIVERSITY __ Explanation of increase __ Types of Competition (or Niche) __ Examples __ Change in Population Density __ Description of Food Web __ R-Strategists -> K-Strategists (2 points) __ Change in Symbiotic Relationships (increase toward mutualisms) BIOMASS __ Production increase and explanation (2 points) __ __ Examples of Producers (etc.) __ Pyramid or Explanation ENERGETICS __ Source (Sun) __ Utilization - Photosynthesis __ Explanation of Decrease (entropy -unused) OR Pyramid + Explanation __ Climax Stability (Dynamic Equilibrium) __ P/R toward 1 __ Net Productivity Decrease
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ECOLOGY QUESTION 1986: L. PETERSON/AP BIOLOGY Describe the biogeochemical cycles of carbon and nitrogen. Trace these elements from the point of their release from a decaying animal to their incorporation into a living animal. STANDARDS: The question was divided into two sections for grading, with a maximum number of points of 8 per section. For each maximum assigned, there were more points possible to allow the student several ways to reach the maximum. For the CARBON CYCLE, it was possible to earn points for each of the following statements or
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ecology - ECOLOGY QUESTION 1983: L. PETERSON/AP BIOLOGY...

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