Unit 3 test reveiw

How does density affect the growth of a population?

• The higher the density, the less competition for resources

• The higher the density, the more competition for resources

What happens to an ecosystem when a population becomes overpopulated?

• Organisms that rely on the same resources as the overpopulated organism will DECREASE.

• Organisms that rely on the same resources as the overpopulated organism will INCREASE.

If producers were to increase in an ecosystem, how will that affect the other trophic levels?

• Organisms in the other trophic levels will DECREASE.

• Organisms in the other trophic levels will INCREASE.

If an organism in an ecosystem is using resources, what does that do for resource availability for other organisms?

• The amount of resources available to other organisms in that ecosystem INCREASES.

• The amount of resources available to other organisms in that ecosystem DECREASES.

What would happen if abiotic factors were removed from an ecosystem?

• Producers would grow LESS making LESS oxygen for the animals in the ecosystem.

• Producers would grow WORSE making LESS oxygen for the animals in the ecosystem.

• Producers would grow LESS making WORSE oxygen for the animals in the ecosystem.

• Producers would grow WORSE making WORSE oxygen for the animals in the ecosystem.

What best describes the niche of this organism?

• Consumer

• Producer

• Predator

• Scavenger

What would happen if two species lived in the same niche in a community for a very long time?

• A. ) The two species would eat each other and die off.

• B.) The two species would compete with each other for resources and eventually one would die off.

• C.) The two species would reach equilibrium and be just fine.

• D. ) The two species would have to move to a new ecosystem.

Which of the following would be a limiting factor for the producers in the ecosystem pictured below?

• Water

• Sunlight

• Minerals

• Soil

Which of the following is an example of mutualism?

• 
• 

Which definition best describes the relationship between a parasite and its host?

• A symbiotic relationship where one species benefits and the other does not benefit nor is it harmed.

• A symbiotic relationship where both species benefit.

• A symbiotic relationship where one species benefits and the other is harmed.

• A symbiotic relationship where one species is eaten by the other.