Ch 6 Life Science: Changes Over Time Test
Ch 6 Life Science: Changes Over Time Test
- 1.A species is a group of similar organisms that...
- A.
Can mate with each other and produce fertile offspring.
- B.
Can live together on an island.
- C.
Can migrate to an island from the mainland.
- D.
All have exactly the same traits.
- 2.What did Darwin infer from his observations of organisms in South America and the Galapagos Islands?
- A.
The organisms on the Galapagos Islands were virtually identical to mainland organisms.
- B.
A small number of different plant and animal species had come to the mainland from the Galapagos Islands.
- C.
The organisms on the Galapagos Islands were completely unrelated to mainland organisms.
- D.
A small number of different plant and animal species had come to the Galapagos Islands from the mainland.
- 3.Differences between members of the same species are called...
- A.
Predators
- B.
Selections
- C.
Traits
- D.
Variations
- 4.What is the role of genes in evolution?
- A.
Only genes can be acted on by natural selection.
- B.
Parents with recessive genes die from overproduction.
- C.
The genes of most surviving parents have only dominant alleles.
- D.
Only traits that are controlled by genes can be acted on my natural selection.
- 5.What are fossils?
- A.
Molds and casts of organisms that live today.
- B.
Drawings of ancient animals and other organisms.
- C.
Footprints or burrows of small animals that live today.
- D.
The preserved remains or traces of organisms that lived in the past.
- 6.How long is Precambrian Time in Geologic Time Scale?
- A.
4 million years
- B.
4.6 million years
- C.
4 billion years
- D.
4.6 billion years
- 7.What theory proposes that evolution occurs steadily in tiny changes over long periods of time?
- A.
Gradualism
- B.
Relative dating
- C.
Natural selection
- D.
Punctuated equilibria
- 8.What theory agrees with fossil records that show no intermediate forms for long periods of time?
- A.
Gradualism
- B.
Natural selection
- C.
Evolution
- D.
Punctuated equilibria
- 9.Which term refers to similar structures that related species have inherited from a common ancestor?
- A.
DNA sequences
- B.
Developmental organisms
- C.
Homologous structures
- D.
Punctuated equilibria
- 10.If two organisms look very similar during their early stages of development, this is evidence that the organisms...
- A.
Are not related.
- B.
Evolved from different ancestors.
- C.
Have exactly the same DNA.
- D.
Evolved from a common ancestor.
- 11.A branching tree is...
- A.
A diagram showing how scientists think different groups of organisms are related.
- B.
A species of tree that is not closely related to other tree species.
- C.
A drawing that shows where different animals live in a tree.
- D.
A homologous structure that many plants have.
- 12.Scientists combine evidence from fossils, body structures, early development, DNA and protein structures to ...
- A.
Determine what bones an animal has in its forelimbs.
- B.
Determine the evolutionary relationships among species.
- C.
Decide which fossils are older than others.
- D.
Determine whether an organism will have gills during its early development.
- 13.What did Darwin observe about finches in the Galapagos Islands?
- A.
Their feathers were adapted to match their environment.
- B.
Their beaks were adaptations related to the foods the finches ate.
- C.
They had identical phenotypes in all locations.
- D.
They had identical genotypes in all locations.
- 14.The gradual change in a species over time is called...
- A.
Mutation
- B.
Evolution
- C.
Migration
- D.
Variation
- 15.A trait that helps an organism survive and reproduce is called a(n)...
- A.
Mutation
- B.
Selection
- C.
Adaptation
- D.
Variation
- 16.Which term refers to the process by which individuals that are better adapted to their environment are more likely to survive and reproduce?
- A.
Natural selection
- B.
Overproduction
- C.
Competition
- D.
Variation
- 17.Darwin concluded that organisms on the Galapagos Islands..
- A.
Had changed over time.
- B.
Had remained the same.
- C.
Were the result of selective breeding.
- D.
Had no variations.
- 18.Which of these is one of the main ways that new species forms?
- A.
Cross-breeding occurs within the species.
- B.
A group is separated from the rest of the species.
- C.
Competition occurs between members of the species.
- D.
Mutations occur in the alleles of members of the species.
- 19.Which term refers to a species that no longer has any living members?
- A.
Molded
- B.
Fossilized.
- C.
Extinct.
- D.
Petrified.
- 20.Which theory proposes that species evolve during short periods of rapid change?
- A.
Gradualism
- B.
Evolution
- C.
Absolute dating
- D.
Punctuated equilibria
- 21.Which term refers to a species creating more offspring than can possibly survive?
- A.
Natural selection
- B.
Overproduction
- C.
Evolution
- D.
Variation
- 22.Which evidence suggests that the ancestors of whales once walked on land?
- A.
Scientists have found fossils of whale like creatures that had legs.
- B.
Whales perform walking motions as they swim.
- C.
Whales have similar DNA to elephants.
- D.
Whales breathe through lungs.
- 23.How does natural selection lead to evolution?
- A.
Stronger offspring kill weaker members of the species.
- B.
Helpful variations accumulate among surviving members of the species.
- C.
Overproduction provides food fro stronger members of the species.
- D.
Environmental changes favor weaker members of the species.
- 24.Why do scientists think related species have similar body structures and development patterns?
- A.
The species inherited many of the same genes from each other.
- B.
The species inherited many of the same proteins from each other.
- C.
The species inherited all of the same genes from a common ancestor.
- D.
The species inherited many of the same genes from a common ancestor.
- 25.Which of the following is most likely to become preserved as a fossil?
- A.
A leaf
- B.
A worm
- C.
A jellyfish
- D.
A clam shell
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