NEW
Font size
WorksheetsKeystone Species
Total questions: 15
Worksheet time: 8mins
What is the definition of a keystone species?
A species that has a large impact on its habitat
A species that is at the top of the food chain
A species that is endangered
A species that is found in Yellowstone National Park
What happened to the grey wolf population in Yellowstone National Park in the early 1930s?
Their numbers increased significantly
Their numbers remained stable
Their numbers dropped to zero
Their numbers doubled
How did the absence of wolves in Yellowstone National Park affect the behavior of elk?
Elk became more cautious and nomadic
Elk became less cautious and settled in one place
Elk started hunting wolves
Elk migrated to a different habitat
What happened to the trees and plants in Yellowstone National Park when the elk population increased?
The trees and plants flourished
The trees and plants declined
The trees and plants remained the same
The trees and plants migrated to a different area
What is the role of beavers in the ecosystem?
They prey on elk
They build dams and create habitats
They eat plants and trees
They control the wolf population
What happened to the willows and beaver colonies in Yellowstone National Park after the reintroduction of wolves?
They declined
They remained the same
They increased
They migrated to a different area
What is the impact of elephants on their environment?
They help spread seeds to new places
They eat all the plants and trees
They build dams and prevent floods
They control the population of other animals
What happens to the forest when African Forest elephants are absent?
The forest becomes more diverse
The forest becomes dominated by a single species of tree
The forest remains the same
The forest disappears
What is the role of parrotfish in coral reefs?
They eat algae and help keep the reef healthy
They build coral reefs
They prey on other fish
They control the temperature of the water
What happens to coral reefs when parrotfish are heavily fished?
The reefs become healthier
The reefs become more diverse
The reefs become dominated by macroalgae
The reefs disappear
What are some factors that are degrading coral reefs?
Climate change, ocean acidification, and pollution
The presence of parrotfish
The absence of parrotfish
The presence of elephants
What is the main food source of parrotfish?
Coral
Algae
Plants
Insects
What is the impact of parrotfish on coral reefs?
They help the reefs recover from sudden heating or hurricanes
They destroy the coral reefs
They control the population of other fish
They prevent pollution in the water
What is the role of elephant dung in the ecosystem?
It provides food for other animals
It helps spread seeds and provides nutrients
It helps control the population of other animals
It helps build dams and prevent floods
What type of animal is a kudu?
A type of antelope
A type of bird
A type of lizard
A type of beetle
