Communities and Populations

What is a group of organisms of ONE species that live in an area at the same time?

• community

• population

• ecosystem

All of the populations living in an area is called a __________.

• community

• population

• ecosystem

Does the picture represent a population or community?

• population

• community

Does the picture represent a population or community?

• population

• community

In which type of interaction do both species benefit?

• predation
• mutualism
• commensalism
• parasitism

Which of these relationships is an example of parasitism?

• a bird building a nest on a tree branch
• a bat pollinating a saguaro cactus
• a flea living on a cat's blood
• ants protecting a tree that produces the ants' only food

In general, which of the following is a true statement about population size?

• If birth rate < death rate, population size increases
• If death rate < birth rate, population size decreases
• If birth rate > death rate, population size increases
• If death rate > birth rate, population size increases

How do you think an increase in the fox population affected the hare population?

• The hares decreased beacause there were fewer food sources
• The hares increased because there were more food sources
• The hares decreased because there were more fox to prey on them
• The hares increased because they had more space 

A symbiotic relationship in which one species benefits and the other is harmed

• mutualism
• predation
• commensalism
• parasitism

A symbiotic relationship in which one organism benefits and the other species is unaffected?

• mutualism

• predation

• commensalism

• parasitism