AP Biology. Sample Student Responses and Scoring Commentary. Inside: Free Response Question 5. Scoring Guideline. Student Samples. Scoring Commentary
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1 2017 AP Biology Sample Student Responses and Scoring Commentary Inside: Free Response Question 5 Scoring Guideline Student Samples Scoring Commentary 2017 The College Board. College Board, Advanced Placement Program, AP, AP Central, and the acorn logo are registered trademarks of the College Board. AP Central is the official online home for the AP Program: apcentral.collegeboard.org
2 AP BIOLOGY 2017 SCORING GUIDELINES Question 5 Figure 1. Characteristics of a pond community over time Microcystis aeruginosis is a freshwater photosynthetic cyanobacterium. When temperatures increase and nutrients are readily available in its pond habitat, M. aeruginosis undergoes rapid cell division and forms an extremely large, visible mass of cells called an algal bloom. M. aeruginosis has a short life span and is decomposed by aerobic bacteria and fungi. Identify the metabolic pathway and the organism that is primarily responsible for the change in oxygen level in the pond between times I and II AND between times III and IV. Identification (2 points per row; 4 points maximum) Time Period Metabolic pathway (1 point per box) Organism (1 point per box) I II Photosynthesis Cyanobacteria (M. aeruginosis) III IV Cellular respiration Decomposers/fungi/bacteria 2017 The College Board.
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6 AP BIOLOGY 2017 SCORING COMMENTARY Question 5 Overview This question focused on analyzing data to identify the causes of change in oxygen levels in a pond community. Students were presented with a graph showing the relative concentrations of cyanobacteria, decomposers, and oxygen in a pond ecosystem over time. Students were asked to identify the metabolic pathway and the organism that was primarily responsible for the change in oxygen levels between time points. Sample: 5A Score: 4 The response earned 1 point for identifying that the metabolic pathway responsible for the change in oxygen level in the pond between times I and II is photosynthesis. The response earned 1 point for identifying that the organism responsible for the change in oxygen level between times I and II is the photosynthetic cyanobacterium. The response earned 1 point for identifying that the metabolic pathway responsible for the change in oxygen level between times III and IV is cellular respiration. The response earned 1 point for identifying that the organism responsible for the change in oxygen level between times III and IV is the aerobic bacteria. The response could have earned 1 point for identifying fungi or decomposers as the organism responsible for the change in oxygen level between times III and IV, but the point had already been earned. Sample: 5B Score: 3 The response earned 1 point for identifying that the metabolic pathway responsible for the change in oxygen level in the pond between times I and II is photosynthesis. The response earned 1 point for identifying that the organism responsible for the change in oxygen level between times I and II is Microcystis aeruginosis. The response earned 1 point for identifying that between times III and IV the organism responsible for the change in oxygen level is the bacteria. The response could have earned 1 point for identifying fungi as the organism responsible for the change in oxygen level between times III and IV, but the point had already been earned. Sample: 5C Score: 2 The response earned 1 point for identifying that the organism responsible for the change in oxygen level between times I and II is the cyanobacteria. The response earned 1 point for identifying that the organism responsible for the change in oxygen level in the pond between times III and IV is the decomposers The College Board.
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