Unit 8 Biology Review

Lesson 8.1 - 12 MCQs: Lines of Evidence for Evaluation

Which of the following best describes the term “evolution”?
a) The sudden creation of new species overnight
b) The gradual change in species over time through genetic variation and natural selection
c) The extinction of all living organisms
d) The process of cloning identical organisms
What does the fossil record provide as evidence for evolution?
a) Proof that all species appeared at the same time
b) A timeline showing gradual changes in species over millions of years
c) Evidence that species never change
d) Information only about living species
How do homologous structures support the theory of evolution?
a) They show that different species share a common ancestor
b) They prove that all species are identical
c) They indicate that species evolved independently without relation
d) They show that evolution has stopped
What is an example of a homologous structure?
a) The wings of a bat and the arms of a human
b) The wings of a butterfly and the wings of a bird
c) The fins of a fish and the tail of a dog
d) The shell of a turtle and the feathers of a bird
What do analogous structures indicate about evolution?
a) They show that similar traits can evolve independently in unrelated species
b) They prove that all species share the same ancestor
c) They show that evolution only occurs in mammals
d) They indicate that species never adapt to their environment
How does comparative embryology provide evidence for evolution?
a) It shows that embryos of different species have similar developmental stages
b) It proves that embryos of all species are completely different
c) It shows that only mammals have embryos
d) It demonstrates that evolution occurs only after birth
What does molecular biology reveal about evolutionary relationships?
a) Species with similar DNA sequences are more closely related
b) DNA has no role in determining evolutionary relationships
c) All species have identical DNA
d) Evolution cannot be studied using molecular data
How does biogeography support the theory of evolution?
a) It shows how species are distributed across different geographic regions
b) It proves that all species live in the same environment
c) It shows that species never migrate or adapt
d) It demonstrates that geography has no effect on evolution
What is a vestigial structure?
a) A structure that has lost its original function through evolution
b) A newly developed organ in a species
c) A structure that is essential for survival
d) A structure that appears only in extinct species
Which of the following is an example of a vestigial structure in humans?
a) The appendix
b) The heart
c) The lungs
d) The brain
How does artificial selection provide evidence for evolution?
a) It shows how humans can influence traits in species through selective breeding
b) It proves that evolution only occurs naturally
c) It demonstrates that species cannot change
d) It shows that evolution happens randomly without selection
What is the significance of transitional fossils in understanding evolution?
a) They show intermediate forms between ancestral and modern species
b) They prove that species never change
c) They show that all species evolved at the same time
d) They demonstrate that fossils cannot provide evolutionary evidence

Lesson 8.2 - 12 MCQs: Theory of Natural Selection

What is the main idea behind Charles Darwin’s theory of natural selection?
a) All species were created at the same time and never change
b) Organisms with traits best suited to their environment are more likely to survive and reproduce
c) Evolution occurs randomly without any environmental influence
d) Only the strongest organisms survive, regardless of adaptation
What is the term used to describe differences in traits among individuals of the same species?
a) Mutation
b) Variation
c) Adaptation
d) Evolution
How does natural selection lead to evolution over time?
a) By eliminating all genetic variation in a population
b) By favoring traits that increase survival and reproduction, which become more common in future generations
c) By forcing all organisms to become identical
d) By preventing any change in species
Which of the following is an example of an adaptation?
a) A polar bear’s thick fur for surviving cold climates
b) A bird forgetting how to fly
c) A fish living on land
d) A tree losing all its leaves permanently
What role does the environment play in natural selection?
a) It determines which traits are advantageous for survival
b) It has no effect on which organisms survive
c) It causes all organisms to evolve in the same way
d) It prevents species from changing
What does the phrase “survival of the fittest” mean in the context of natural selection?
a) Only the physically strongest organisms survive
b) The organisms best adapted to their environment are more likely to survive and reproduce
c) All organisms have an equal chance of survival
d) Fitness refers only to speed and strength
What is the source of new traits that natural selection can act upon?
a) Genetic mutations and recombination
b) Environmental destruction
c) Lack of reproduction
d) Climate stability
Why is overproduction of offspring important in natural selection?
a) It ensures that all offspring survive
b) It creates competition for resources, allowing only the best-adapted individuals to survive
c) It prevents evolution from occurring
d) It reduces variation in a population
What happens to individuals with traits that are not well suited to their environment?
a) They are more likely to die before reproducing
b) They always survive and reproduce
c) They become dominant in the population
d) They stop evolving
How does natural selection differ from artificial selection?
a) Natural selection occurs without human influence, while artificial selection is guided by humans
b) Both processes are controlled by humans
c) Artificial selection happens in nature without interference
d) Natural selection only occurs in laboratories
What evidence supports the theory of natural selection?
a) Fossil records, genetic similarities, and observed adaptations in species
b) The belief that species never change
c) The idea that all species are unrelated
d) The absence of variation in populations
What is the ultimate result of natural selection acting on a population over many generations?
a) The population becomes better adapted to its environment
b) The population stops reproducing
c) The population becomes genetically identical
d) The population goes extinct immediately