Organism Interactions Test

What would most likely happen if a new predator species was introduced to an ecosystem?

• Prey populations would immediately increase.

• The predator would replace all existing predators in the area.

• Prey populations would likely decrease, affecting the entire food web.

• Other species in the ecosystem would be unaffected.

Which of the following best explains why limiting factors influence population size in an ecosystem?

• They regulate the number of species that can coexist in an ecosystem.

• They prevent new species from entering the ecosystem.

• They ensure all organisms have equal access to resources.

• They create a constant population size for every species.

How does competition affect the survival of plants in an ecosystem?

• Plants that require more water always outcompete other plants.

• Only plants that can obtain enough resources will survive.

• All plants in an area receive equal sunlight and nutrients.

• Competition only occurs when there is an abundance of resources.

Which scenario best illustrates the role of a niche in an ecosystem?

• A deer, rabbit, and chipmunk all eating the same food source.

• A deer feeding on leaves, a rabbit eating grass, and a chipmunk eating acorns.

• A group of birds migrating to another ecosystem.

• A predator hunting multiple species for food.

What might happen to a food web if plant populations declined significantly?

• The food web would remain unaffected.

• Herbivores would decrease, causing predators to decline as well.

• The ecosystem would have more energy available for animals.

• Carnivores would switch to eating plants instead.

Why do predator and prey populations often follow cyclical patterns over time?

• Prey populations grow indefinitely, leading to more predators.

• Predators always outnumber prey, keeping populations stable.

• As predator numbers increase, more prey is consumed, which then leads to less food for predators.

• Prey populations never recover from predation.

Based on the graph, what happens to the amount of kelp as sea otter numbers decrease?

• As the sea otter population decreases, kelp increases.

• As the sea otter population decreases, kelp decreases.

• As the sea otter population decreases, kelp doesn't change.

Environmental conditions that prevent populations from increasing

• abiotic factors
• carrying capacity
• limiting factors
• biotic factors

What happened to the wolf population between 1980 and 1982?

• it increased rapidly
• it decreased rapidly

An organism's specific role in an ecosystem

• population
• ecosystem
• niche
• limiting factor