Community Interaction worksheet
A. Using the Food chain- Ecology Gizmo on my website fill in the following questions
1.If a disease strikes the snake population in the food chain shown, what will be the
effect on the populations of hawks and rabbits?

A. The populations of hawks and rabbits will decrease.

B. The populations of hawks and rabbits will increase.

C. The population of hawks will increase. The population of rabbits will
decrease.

D. The population of hawks will decrease. The population of rabbits will
increase.
2.In the stable food chain shown below, what would you expect to happen initially if
you were to suddenly double the population of rabbits?

A. The populations of the other three species would also increase.

B. The populations of the other three species would decrease.

C. The grass population would decrease. The snake population and hawk
population would increase.

D. The grass population and hawk population would decrease. The snake
population would increase.
3.What event within the food chain might lead to the graph shown below?

A. A disease in the population of rabbits

B. A disease in the population of snakes

C. A disease in the population of hawks

D. It's impossible to tell which of the above occurred.
4.What most likely caused the rabbit population to decrease over the first week shown
in the following graph?

A. A disease in the population of rabbits

B. A decreasing population of grasses

C. An increasing population of hawks

D. A higher-than-ideal population of snakes
B. Please fill in the following worksheet using the Community Interact PowerPoint
Presentation
1. What are the three types of interactions?
2. Why do organisms compete and what do they compete for? (Hint: talk about niche)
3. Give an example or territorialism
4. Describe the differences between the 2 types of competition
5. Describe Saprophylism and give an example.
6. Describe mutualism and give an example ( one that is not listed on the PowerPoint
presentation)
7. Describe commensalisms and give an example ( one that is not listed on the PowerPoint
presentation)
8. Fill in the table with the following characters
= species is hurt or killed (negative repercussions)
 = species benefits
 = species has no benefit or damage
Interaction
Predation
Mutualism
Commensalisms
Species 1
Species 2