This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: AP ® BIOLOGY 2006 SCORING GUIDELINES © 2006 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents). 4 Question 2 According to fossil records and recent published observations, two species of leaf-eating beetles (species A and B) have existed on an isolated island in the Pacific Ocean for over 100,000 years. In 1964 a third species of leaf-eating beetle (species C) was accidentally introduced on the island. The population size of each species has been regularly monitored as shown in the graph above. (a) Propose an explanation for the pattern of population density observed in species C. [3 points] 1. Description of curve [1 point]: Type of growth is exponential growth (logarithmic or J-shaped curve acceptable). 2. Explanation must describe the growth using an understanding of [1 point each, 2 points maximum]: Lack of limiting factors Low competition Abundant food Low predation Ideal environmental conditions (habitat, temperature, moisture, etc.) Access to mates (b) Describe the effect that the introduction of beetle species C has had on the population density of species A and species B. Propose an explanation for the patterns of population density observed in species A and in species B. [4 points] 1. Describe effect [1 point]: Species C has had little or no effect on species A; however, as species C increases, B decreases. Both lines must be addressed for the point....
View Full Document
This note was uploaded on 09/25/2011 for the course BIO 111 taught by Professor Stanton during the Spring '11 term at Baptist College of Health Sciences.
- Spring '11