Name ________________________ Date ___________ Period _________
Population Ecology
10. Population density can be calculated by using the formula _________________________________ M. is _______________________, and V is _______________________________________________.
11. What is the density of a population of 250 rats living in a 150 square meter lot? Show all work for credit.
12. How many earthworms are found in a 100 square meter lot if its density is 39 worms per square meter?
Show all work for credit.
13. Density ____________________Factors operate more strongly on large populations than on small ones.
14. When populations become crowded individuals ___________________for the valuable resources.
15. Determine the type of density dependent factor which applies to each of the following situations by checking the box in the table below.
16. Weather and natural disasters act independently of a population's density. These factors are called density _____________factors.
17. _____________is defined as the relationships between organisms.
18. ___________________________is a relationship involving one organism receiving a benefit while the other is neither helped nor harmed.
19. _____________________________is a relationship where both organisms benefit from the relationship.
20. Using a line graph, graph the following data below and answer the questions that follow.
21. What was the independent variable? Why?
22. What is (are) the dependent variable(s)? Why?
23. Why was there a decrease in the number of rabbits from 1920 to 1930?
24. What is the mean number of rabbits per acre from 1920-70?
25. What are the foxes categorized as based on the above data?
26. If all the foxes were to disappear, what would keep the rabbit population in check over a period of time?