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WorksheetsUnit 3 reveiw
Total questions: 10
Worksheet time: 6mins
What can you conclude from the fact that more than a billion species have gone extinct during the 4.5 billion year history of the Earth?
Extinction is not natural and can be stopped.
Extinction can only occur if humans are still a impact.
Extinction is a natural process that can not be stopped.
If sheep survived mainly on grass and there was a fire that eliminated their food source, what would happen to the sheep?
The sheep population would increase.
The sheep population would stay the same.
The sheep population would decrease.
The sheep population would go extinct.
In Yellowstone National Park, the wolves were removed to protect livestock. Their removal changed the ecosystem drastically. They might be called
A keystone species
A primary consumer
a limiting factor
a primary consumer
What happens to an ecosystem when a population becomes overpopulated?
Orgainisms that rely on the same resources will increase.
Orgainisms that rely on the same resources will decrease.
Orgainisms that rely on the same resources will stay the same.
If producers were to increase in an ecosystem, how will that affect the other trophic levels?
The orgainsms would increase in trophic levels.
The orgainsms would decrease in trophic levels.
Orgainsms would stay the same in trophic levels.
What would happen if two species lived in the same niche?
The two species would eat each other and both die off.
The two species would go in competition and one of the species would die out.
The two species would reach equailbruim and be just fine.
Both of the species would have to move to different ecosystems.
Which definition best describes the relationship between a parasite and its host?
A symbiotic relationship where one species benefits and the other is harmed.
A symbiotic relationship where both species benefit.
A symbiotic relationship where one species benefits and the other does not benefit nor is it harmed.
A symbiotic relationship where one species is eaten by the other.
How would an organism that has very few predators affect an ecosystem if it were to die out?
The producers would die out.
The whole ecosystem would die out.
The ecosystem would reach equilibrium.
The herbivores would overpopulate.
When a new species is introduced into an ecosystem, the population of their prey species will decrease.
TRUE
FALSE
If humans began removing one species in an ecosystem, how will that affect the other species?
The species in the trophic levels below the species will INCREASE while the species in trophic levels above the species will DECREASE.
The species in the trophic levels below the species will DECREASE while the species in trophic levels above the species will INCREASE.
The species in the trophic levels below the species will STAY THE SAME while the species in trophic levels above the species will DECREASE.
The species in the trophic levels below the species will INCREASE while the species in trophic levels above the species will STAY THE SAME.
