Ecosystems and Invasive Species Quiz

What is the difference between introduced and invasive species?

• Introduced species are native to an ecosystem, while invasive species are non-native

• Introduced species positively affect ecosystems, while invasive species negatively affect ecosystems

• Introduced species spread quickly, while invasive species do not survive well in ecosystems

• Introduced species do not survive well in ecosystems, while invasive species spread or take over

Answer explanation

Introduced species do not survive well in ecosystems, while invasive species spread or take over

How can organisms affect ecosystems?

• Organisms negatively affect ecosystems by preying on other animals and carrying diseases

• Organisms positively affect ecosystems by building structures and making products

• Organisms negatively affect ecosystems by providing food, water, space, and shelter

• Organisms positively affect ecosystems by releasing waste and causing pollution

Answer explanation

Organisms negatively affect ecosystems by preying on other animals and carrying diseases.

How do invasive species affect populations in ecosystems?

• Invasive species have no impact on the populations of native organisms in an ecosystem

• Invasive species block sunlight needed by native plants and reinforce the stability of an ecosystem

• Invasive species use food sources needed by native plants and change existing food chains and food webs

• Invasive species increase the population of native plants and decrease the population of native animals

Answer explanation

Invasive species use food sources needed by native plants and change existing food chains and food webs.

What is the purpose of an ecological pyramid?

• To show the relationship among different food chains in an ecosystem

• To demonstrate the transfer of matter and energy among organisms in an ecosystem

• To illustrate the sequence of living things in an ecosystem

• To display the amount of energy available and the number of organisms in an ecosystem

Answer explanation

The purpose of an ecological pyramid is to display the amount of energy available and the number of organisms in an ecosystem.

What is the bottom of the ecological pyramid?

• Producers

• Consumers

• Decomposers

• Apex predators

Answer explanation

The bottom of the ecological pyramid is occupied by producers, which are the primary source of energy in the ecosystem.

What happens as energy moves up the food chain in an ecological pyramid?

• The energy increases but the number of organisms decreases

• The energy decreases but the number of organisms increases

• The energy and the number of organisms increase

• The energy and the number of organisms decrease

Answer explanation

As energy moves up the food chain, both the energy and the number of organisms decrease.

What is the immediate threat caused by invasive species?

• Providing food, water, space, and shelter

• Releasing waste and causing pollution

• Building structures and making products

• Outcompeting for resources

Answer explanation

The immediate threat caused by invasive species is outcompeting for resources.

Why are invasive animals harder to control than invasive plants?

• Invasive animals spread quickly, while invasive plants do not survive well in ecosystems

• Invasive animals have a lower impact on native species than invasive plants

• Invasive animals have a higher survival rate in ecosystems than invasive plants

• Invasive animals are better able to compete for resources than invasive plants

Answer explanation

Invasive animals outcompete invasive plants for resources, making them harder to control.

What is the effect of sea turtles that eat crabs being introduced into an ecosystem?

• The population of crabs would increase

• The population of crabs would decrease

• The population of crabs would remain unchanged

• The population of crabs would become extinct

Answer explanation

Sea turtles that eat crabs would decrease the population of crabs in the ecosystem.

What is the role of apex predators in an ecosystem?

• To build structures and make products for the stability of the ecosystem

• To control the balance of the food web and prevent populations from collapsing

• To provide food, water, space, and shelter for other organisms in the ecosystem

• To release waste and cause pollution for the survival of other organisms

Answer explanation

Apex predators control the food web, preventing population collapse and maintaining balance.