Worksheet: Competition in Animals

In this worksheet, we will practice describing some factors that animals in an ecosystem will compete for, and outlining what makes an animal a successful competitor.

Q1:

Lions and hyenas share the same food sources. When the availability of these food sources decreases, what interaction is promoted between lions and hyenas?

Lions and hyenas
  • ASymbiosis
  • BPredation
  • CMutualism
  • DCompetition
  • EMating

Q2:

Which of the following best defines competition?

  • ACompetition is the interaction between organisms that occurs when shared resources are limited.
  • BCompetition occurs when two organisms live together and both benefit from the relationship.
  • CCompetition occurs when one organism takes resources from another, harming itself in the process.
  • DCompetition is the interaction between organisms when they both inhabit the same ecosystem.

Q3:

The picture shows two male mandrills belonging to the same group. What resource are these males most likely to compete over?

Two male mandrills
  • AMates
  • BTerritory
  • CWater
  • DSpace

Q4:

Two organisms are competing for the same territory. What is most likely to happen to the organism that is the weaker competitor?

  • AThey will lose access to that territory.
  • BThey will only be able to inhabit the territory some of the time.
  • CThey will gain access to that territory.

Q5:

The signal crayfish was introduced to the UK from North America in the 1970s as a food source, but it spread rapidly through UK rivers, lakes, and ponds. The graph provided shows the population estimates of signal crayfish and the native white-clawed crayfish at different sites across the UK.

Which of the following best describes the trend shown in the graph?

  • AIn almost all areas, signal crayfish are more abundant than white-clawed crayfish.
  • BIn most areas, the populations of the crayfish species are equal.
  • CIn almost all areas, signal crayfish are less abundant than white-clawed crayfish.
  • DIn all areas, signal crayfish are more abundant than white-clawed crayfish.

Which of the following best explains the trend shown in the graph?

  • AIn all areas, the signal crayfish outcompetes the white-clawed crayfish.
  • BIn most areas, the signal crayfish outcompetes the white-clawed crayfish.
  • CIn most areas, both species of crayfish are just as well-adapted for the environment.
  • DIn most areas, the white-clawed crayfish outcompetes the signal crayfish.

Q6:

Red squirrels are native to the UK. In the 1800s, gray squirrels were introduced to the UK from Northern America. Both species occupy the same ecological niche. The graph provided shows the number of sightings of both of these species in an area of England. Which of the following best explains what has happened to the numbers of red squirrels?

  • ARed squirrel numbers are kept low because gray squirrels outcompete them for resources.
  • BRed squirrel numbers rise as gray squirrel numbers do because they are interdependent.
  • CRed squirrel numbers increased in 2014 as they predated on gray squirrels.
  • DRed squirrel numbers are kept low as gray squirrels predate on them.

Q7:

In areas of the USA, non-native species of deer were introduced into wildlife parks for hunting. The table provided shows how the non-native sika deer and the native white-tailed deer numbers changed in one particular area over time.

YearNumber of Sika DeerNumber of White-Tailed Deer
19711010
19721518
19732015
19742211
1975309
1976385
1977445
1978514

Describe the trend shown in the table.

  • AAs the number of sika deer increased, the number of white-tailed deer decreased.
  • BAs the number of white-tailed deer increased, the number of sika deer decreased.
  • CThere is no correlation between the numbers of the two species of deer.

Explain the trend shown in the table.

  • AThe white-tailed deer outcompeted the sika deer for resources, so not as many sika deer could survive.
  • BThe sika deer outcompeted the white-tailed deer for resources, so not as many white-tailed deer could survive.
  • CThere was an increase in competition, so both populations had a decrease in population size.

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