Symbiosis
Population Graphs
Vocabulary
True/False
Fast Facts
100
This type of ecosystem relationship is where one organism hunts the other for food
Predation (predator-prey)
100
A deer population grows quickly, then levels off. Later, it suddenly drops. What is ONE possible reason for this drop?
Any limiting factor (not enough food, water, shelter, space, mates, presence of disease, human activity, weather conditions, etc)
100
This type of organism hunts another for food.
Predator
100
True or False: Populations can grow in size forever.
False
100
Give TWO examples of a limiting factor
Food, water, shelter, space, mates, disease, human activity, weather conditions, etc
200
What type of ecosystem relationship is depicted in the image?
Mutualism
200
What does the x-axis on a population graph always mean?
Time
200
This type of ecosystem relationship is where two organisms fight for the same resource such as food, shelter, or a mate.
Competition
200
True or False: Zebra mussels are considered an invasive species.
True
200
When more individuals are born than die, the population will…
increase
300
What type of ecosystem relationship is depicted in the image?
Competition
300
What does the red dashed line represent in the graph?
Carrying Capacity
300
Environmental factors that cause a population graph to stop growing or decrease in size are known as these.
Limiting Factors
300
True or False: Sea otters are an invasive species.
False
300
This type of species is not native to an ecosystem and often harms native organisms by outcompeting them for resources.
Invasive species
400
What type of ecosystem relationship is depicted by this type of graph? 
Commensalism
400
What type of ecosystem relationship is depicted by this cyclical graph?
Predator-Prey Interaction
400
The largest population size an ecosystem can support is known as this.
Carrying capacity
400
True or False: When there are less resources available, competition will increase.
True
400
This type of species has a large impact on its ecosystem, and removing it can cause major changes to the entire food web.
Keystone species
500
A flea and a dog are an example of this ecosystem relationship.
Parasitism
500
In which years would you expect Moose hunting to have began?
1995
500
This type of ecosystem relationship is when one organism benefits and the other is unbothered
Commensalism
500
True or False: A population will never exceed carrying capacity.
False!
500
This type of ecosystem relationship is where BOTH organisms benefit from eachother
Mutualism