Natural Selection & Darwin’s Theory
1. Who is most closely associated with the theory of evolution by natural selection?
(A) Gregor Mendel
(B) Charles Darwin
(C) Louis Pasteur
(D) Robert Hooke
Answer: (B) Charles Darwin
2. Darwin proposed that organisms evolve primarily through:
(A) Natural selection
(B) Photosynthesis
(C) Artificial fertilization
(D) Binary fission
Answer: (A) Natural selection
3. Natural selection occurs because:
(A) All organisms are genetically identical
(B) Individuals with advantageous heritable traits tend to leave more offspring
(C) Organisms consciously change their genes when needed
(D) All individuals have the same survival chances
Answer: (B) Individuals with advantageous heritable traits tend to leave more offspring
4. The phrase “survival of the fittest” refers mainly to:
(A) Survival of the physically strongest organisms only
(B) Survival and reproduction of organisms better suited to their environment
(C) Survival of the largest organisms
(D) Survival of the oldest organisms
Answer: (B) Survival and reproduction of organisms better suited to their environment
5. According to Darwin, which factor is essential for natural selection?
(A) Variation among individuals
(B) Identical characteristics in all individuals
(C) Absence of competition
(D) Lack of reproduction
Answer: (A) Variation among individuals
6. Which of the following best illustrates natural selection?
(A) Bacteria with antibiotic resistance surviving treatment and reproducing
(B) A person developing larger muscles through exercise
(C) A plant bending toward light during its lifetime
(D) A student learning a new language
Answer: (A) Bacteria with antibiotic resistance surviving treatment and reproducing
Adaptation
7. An adaptation is best defined as:
(A) A temporary change caused by exercise
(B) A heritable characteristic that improves survival or reproduction in a particular environment
(C) A disease affecting a population
(D) A change that occurs only during an individual’s lifetime
Answer: (B) A heritable characteristic that improves survival or reproduction in a particular environment
8. The streamlined body of a fish is an adaptation mainly for:
(A) Flying
(B) Efficient movement through water
(C) Producing more oxygen
(D) Preventing reproduction
Answer: (B) Efficient movement through water
9. The thick fur of polar bears is an adaptation that helps them:
(A) Absorb sunlight
(B) Reduce heat loss
(C) Increase water loss
(D) Digest food faster
Answer: (B) Reduce heat loss
10. The long neck of a giraffe is commonly discussed in evolutionary biology as an example of:
(A) Adaptation
(B) Artificial selection only
(C) Acquired inheritance
(D) Extinction
Answer: (A) Adaptation
11. Which statement about adaptation is correct?
(A) Every adaptation is useful in every environment
(B) An adaptation is related to an organism’s survival and reproduction in a particular environment
(C) Adaptations always develop within one individual’s lifetime
(D) Adaptations are unrelated to heredity
Answer: (B) An adaptation is related to an organism’s survival and reproduction in a particular environment
Evolution
12. Evolution refers to:
(A) Changes in inherited characteristics of populations over generations
(B) Growth of an individual organism
(C) Daily changes in body temperature
(D) Movement of animals from one place to another
Answer: (A) Changes in inherited characteristics of populations over generations
13. Which process provides the raw material for evolutionary change by introducing new genetic variation?
(A) Mutation
(B) Digestion
(C) Respiration
(D) Transpiration
Answer: (A) Mutation
14. Natural selection acts directly on:
(A) Observable characteristics (phenotypes) of individuals
(B) Rocks
(C) Fossils only
(D) Ecosystems only
Answer: (A) Observable characteristics (phenotypes) of individuals
15. Evolution generally occurs at the level of:
(A) Individual organisms during their lifetime
(B) Populations over generations
(C) Individual organs only
(D) Single cells only
Answer: (B) Populations over generations
16. When two populations of the same species become reproductively isolated and eventually form different species, the process is called:
(A) Speciation
(B) Respiration
(C) Germination
(D) Transpiration
Answer: (A) Speciation
Fossils
17. Fossils are important evidence for evolution because they:
(A) Show evidence of organisms that lived in the past
(B) Show only living organisms
(C) Prove that all organisms are unchanged
(D) Are always found in volcanic rocks
Answer: (A) Show evidence of organisms that lived in the past
18. Fossils are most commonly preserved in:
(A) Sedimentary rocks
(B) Igneous rocks
(C) Molten rocks
(D) Fresh lava
Answer: (A) Sedimentary rocks
19. Which fossil is often cited as evidence linking dinosaurs and birds?
(A) Archaeopteryx
(B) Homo sapiens
(C) Australopithecus
(D) Neanderthal
Answer: (A) Archaeopteryx
20. The study of fossils is called:
(A) Ecology
(B) Palaeontology
(C) Cytology
(D) Physiology
Answer: (B) Palaeontology
21. Fossils found in deeper undisturbed layers of sedimentary rock are generally:
(A) Younger
(B) Older
(C) Always living
(D) Artificial
Answer: (B) Older
Application-Based Evolution Questions
22. A population of insects becomes resistant to an insecticide after repeated use. The most likely explanation is:
(A) Individual insects intentionally developed resistance
(B) Resistant individuals survived and reproduced, increasing resistance in the population
(C) The insecticide converted all insects into a new species immediately
(D) Insects stopped reproducing
Answer: (B) Resistant individuals survived and reproduced, increasing resistance in the population
23. Why is excessive use of antibiotics considered a problem in relation to evolution?
(A) It can select for antibiotic-resistant bacteria
(B) It makes all bacteria extinct immediately
(C) It prevents mutations
(D) It stops bacterial reproduction permanently
Answer: (A) It can select for antibiotic-resistant bacteria
24. If a population of moths contains both light and dark individuals and birds more easily detect the light moths on dark tree trunks, over generations the dark moths may become more common. This is an example of:
(A) Natural selection
(B) Photosynthesis
(C) Artificial selection
(D) Genetic engineering
Answer: (A) Natural selection
25. Which statement is most consistent with Darwin’s theory?
(A) Organisms change because they consciously need to adapt
(B) Natural selection can cause advantageous inherited traits to become more common over generations
(C) Individuals acquire useful traits during life and always pass them to offspring
(D) Evolution always produces more complex organisms
Answer: (B) Natural selection
Must-Memorize Evolution Associations
| Topic | Key Fact |
|---|---|
| Charles Darwin | Theory of evolution by natural selection |
| Natural selection | Differential survival and reproduction |
| Survival of the fittest | Better-adapted individuals tend to leave more offspring |
| Variation | Essential for natural selection |
| Mutation | Source of new genetic variation |
| Evolution | Change in inherited characteristics of populations over generations |
| Adaptation | Heritable trait suited to an environment |
| Speciation | Formation of new species |
| Fossils | Evidence of past life and evolutionary history |
| Palaeontology | Study of fossils |
| Sedimentary rocks | Commonly preserve fossils |
| Archaeopteryx | Important transitional fossil between dinosaurs and birds |
| Antibiotic resistance | Example of natural selection |
| Insecticide resistance | Example of natural selection |
| Population | Unit in which evolutionary change is measured over generations |
Competitive Exam Application Patterns
Antibiotic resistance → Natural selection
Insecticide-resistant insects → Natural selection
Variation + environmental pressure → Differential survival/reproduction
Fossils → Evidence of evolutionary history
Archaeopteryx → Dinosaur–bird evolutionary link
Deep sedimentary layers → Generally older fossils
Heritable useful trait → Adaptation
Population changes over generations → Evolution
Reproductive isolation → Speciation
Charles Darwin → Natural selection