Problem Set – Population Ecology (Chapter 40.3- 40.6)
1) Describe the difference between a biotic and abiotic factor in an ecosystem. Give
examples of each factor.
2) Define species. Define population. Define population density.
3) The growth of a population is influenced by four factors. Briefly state (full sentences
- do not list) the four factors.
4) Describe the exponential growth of a population, and discuss the conditions under
which exponential growth occurs. Sketch a graph which shows exponential growth of a
population over time.
5) Write a mathematical sentence which defines growth rate. See your class notes.
6) Explain why the exponential growth of a population does not continue indefinitely.
Define limiting factor, and give an example or two,
7) Define carrying capacity.
8) Sketch a graph of an s-shaped population growth curve which shows a population
having reached carrying capacity. Provide an example of why a population would
fluctuate (oscillate) around carrying capacity.
9) Describe what is meant by density-dependent limiting factor. Give an example.
10) Describe what is meant by density-independent limiting factor. Give an example.