Worksheet: Evidence for Evolution

In this worksheet, we will practice describing the evidence for evolution, and explaining why the theory of evolution is now widely accepted.

Q1:

Organisms that do not evolve to become adapted for their environments may become extinct.

Which of the following is the correct definition of extinction?

  • AThe temporary loss of some members of a species
  • BThe permanent loss of some members of a species
  • CThe temporary loss of all members of a species
  • DThe permanent loss of all members of a species
  • EThe gradual change in an organism over time

Which of the following is not a reason a species may become extinct?

  • AIncrease in sexual reproduction
  • BChange in predator
  • CIntroduction of a new disease
  • DCatastrophic weather event
  • EIntroduction of invasive species

Q2:

Fossils provide important evidence for the evolution of species. What are fossils?

  • AFossils are sections of DNA preserved in ice.
  • BFossils are living organisms that have been alive longer than 300 years.
  • CFossils are rocks and salts that have survived hundreds of years.
  • DFossils are decayed parts of plants.
  • EFossils are remains of organisms preserved in rocks and ice.

Q3:

The development of antibiotic resistance is an example of evolution in bacteria. The diagram given shows a simplified process of antibiotic resistance developing in a population of bacteria.

A population of bacteria shows differences in how resistant its individuals are to antibiotics. What term is given to this difference in characteristics?

  • ASpecialization
  • BVariation
  • CClassification
  • DDifferentiation

Which of the following best describes what happened between stages 1 and 2?

  • AThe antibiotic destroyed the bacteria with the weakest resistance to it.
  • BThe antibiotic destroyed the bacteria with the strongest resistance to it.
  • CThe bacteria destroyed the antibiotics with the weakest resistance to it.
  • DThe bacteria destroyed the antibiotic with the strongest resistance to it.

Which of the following best describes what happened between stages 2 and 3?

  • AMore bacteria began to die off.
  • BThe least resistant bacteria reproduced.
  • CNew bacteria moved into the population.
  • DThe most resistant bacteria reproduced.

What is the advantageous allele that was passed on in this scenario?

  • AAbility to grow quickly
  • BResistance to antibiotics
  • CSlow rate of reproduction
  • DBrightness of color

Q4:

Fossils of simple organisms are found in the oldest rocks, whereas fossils of complex organisms are found in the most recent rocks.

Which of the following statements correctly describes the hypothesis for this?

  • ASimple life forms evolved from complex ones.
  • BComplex life forms evolved from simpler ones.

Q5:

Fossils are valuable resources of information about the evolution of species, but occasionally, they can be incomplete.

Decide if the following statements about an incomplete fossil record are true or false.

Fossils do not form if the right conditions are not met.

  • ATrue
  • BFalse

Once created, fossils cannot be destroyed.

  • AFalse
  • BTrue

All of the fossils that have been created over time have been discovered.

  • ATrue
  • BFalse

Q6:

Plant fossils formed before animal fossils. What does this suggest about their evolution?

  • APlants would not have survived without animals existing first.
  • BAnimals would not have survived without plants existing first.
  • CPlants and animals first existed at the same time.
  • DAnimals have a shorter life span than plants.
  • EPlants are more complex than animals.

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