Lesson Worksheet: Extinction Science

In this worksheet, we will practice defining extinction, recalling why species may go extinct, and explaining the impact extinction can have on ecosystems and biodiversity.


For the following statements about extinction, state if they are true or false.

Meteors colliding with Earth, and the aftereffects, could cause a mass extinction.

  • AFalse
  • BTrue

Humans are not responsible for any species’s extinction.

  • AFalse
  • BTrue

Mass extinctions occur when only a few species of plants are affected.

  • ATrue
  • BFalse


Extinctions can also be caused by human interference. Which of the following is a human activity that could result in mass species extinction?

  • AGardening, leading to the removal of some plant species
  • BReforestation to reestablish lost habitats for species
  • CStoring seeds in gene banks, which requires the removal of seeds from existing plants
  • DPollution, leading to warming the global temperature


Ras Mohammed National Park (Egypt) is an example of a natural protectorate, or protected area. How does this help prevent extinction of species?

Ras Mohamed National Park in Egypt
  • AIt provides an area where species can be bred in captivity to be released into the wild when they are adults.
  • BIt provides an area of land that can be constantly deforested then reforested.
  • CIt designates an area where species are protected from hunting, building, or other changes.
  • DIt provides an area of land where no humans are allowed to go, and the ecosystem is left untouched.


Which of the following allows humans to gain information about species that existed millions of years ago and have gone extinct?

  • AFossils
  • BGenetic engineering
  • CRewilding
  • DPhotographs


Complete the following: A ecosystem is more likely to be affected by one species going extinct than ecosystem.

  • Amarine, a terrestrial
  • Bplant, an animal
  • Cprimary, a secondary
  • Dsimple, a complex


Extinctions can occur on a large scale with many different species, which is known as a mass extinction. Which of the following is a potential cause of a mass-extinction event?

  • AAn increase in available sunlight
  • BA decrease in human activities, such as traveling between countries
  • CToxic or harmful gases released from a large volcanic eruption
  • DA disease specific to one species being passed through a population


Which of the following is a strategy used to prevent species from going extinct?

  • AMerging natural habitats of different species to encourage breeding
  • BRemoving large areas of natural forests to encourage species migration
  • CCreating laws that make it illegal to hunt endangered animals
  • DIncreasing the number of buildings in a very biodiverse area


What does the term extinct mean?

  • AA species only exists in the wild and not in captivity.
  • BThere are only a few hundred members of a species left.
  • CA species is at risk of disappearing.
  • DThere are no surviving members of a species.


Which of the following correctly links extinction and biodiversity?

  • AThe more species that go extinct from an area, the higher the biodiversity.
  • BExtinction has no effect on biodiversity.
  • CThe more species that go extinct from an area, the lower the biodiversity.


Some species are classified as endangered. What does this mean?

  • AThe individuals of that species are highly dangerous to humans.
  • BThe number of individuals of that species is rapidly increasing.
  • CThe species is at risk of going extinct.
  • DThe only surviving members of the species are in captivity.

This lesson includes 9 additional questions for subscribers.

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