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.
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 all members of a species
- BThe temporary loss of some members of a species
- CThe permanent loss of all members of a species
- DThe permanent loss of some 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?
- ACatastrophic weather event
- BChange in predator
- CIntroduction of invasive species
- DIncrease in sexual reproduction
- EIntroduction of a new disease
Fossils provide important evidence for the evolution of species. What are fossils?
- AFossils are sections of DNA preserved in ice.
- BFossils are decayed parts of plants.
- CFossils are remains of organisms preserved in rocks and ice.
- DFossils are rocks and salts that have survived hundreds of years.
- EFossils are living organisms that have been alive longer than 300 years.
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?
Which of the following best describes what happened between stages 1 and 2?
- AThe bacteria destroyed the antibiotic with the strongest 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 antibiotic destroyed the bacteria with the weakest resistance to it.
Which of the following best describes what happened between stages 2 and 3?
- ANew bacteria moved into the population.
- BThe least resistant bacteria reproduced.
- CThe most resistant bacteria reproduced.
- DMore bacteria began to die off.
What is the advantageous allele that was passed on in this scenario?
- ABrightness of color
- BAbility to grow quickly
- CSlow rate of reproduction
- DResistance to antibiotics
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?
- AComplex life forms evolved from simpler ones.
- BSimple life forms evolved from complex ones.
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.
Once created, fossils cannot be destroyed.
All of the fossils that have been created over time have been discovered.
Plant fossils formed before animal fossils. What does this suggest about their evolution?
- APlants would not have survived without animals existing first.
- BPlants and animals first existed at the same time.
- CPlants are more complex than animals.
- DAnimals would not have survived without plants existing first.
- EAnimals have a shorter life span than plants.
The diagram given shows a basic outline of the pentadactyl limb found in vertebrates, using the examples of bats and humans.
How many digits are at the end of a pentadactyl limb?
What does the presence of the pentadactyl limb in all vertebrates suggest about their evolution?
- AVertebrate limbs, by chance, look very similar.
- BAll vertebrates apart from humans evolved from a common ancestor.
- CSome vertebrates evolved from a common ancestor.
- DAll vertebrates evolved from a common ancestor.
Why does the pentadactyl limb appear structurally different in bats and humans?
- AThe pentadactyl limb has specialized for similar functions in different organisms.
- BThe pentadactyl limb in humans has changed more than that in bats.
- CThe pentadactyl limb has specialized for different functions in different organisms.
- DHumans and bats do not share any common ancestors.