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Free Evolution MCQs with Answers

814 Evolution MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.

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Concept of EvolutionLamarckismDarwinism
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814 questions · page 34 of 41

661. Archeobacteria can survive at which of the following temperature(Celcius)?

  • A. 300o
  • B. 150o
  • C. 120o
  • D. 200o

Explanation: A group of bacteria, called archaeobactiria-that tolerate temperatures up to 120°C and seem to have undergone less evolutionary change…

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Correct answer: 120o

662. What was the source of hydrgen for first photosynthetic organisms?

  • A. Water
  • B. Hydrogen present in soil
  • C. Hydrogen sulphate
  • D. Hydrogen Sulphide

Explanation: In the dwindling supply of nutrients, the first photosynthetic organism probably used hydrogen sulfide as hydrogen source to reduce carbon…

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Correct answer: Hydrogen Sulphide

663. Which of the following conditions is not required to be true for a population in Hardy-Weinberg equilibrium?

  • A. Random mutations
  • B. Large population
  • C. No natural selection
  • D. Random mating

Explanation: When mating is random in a large population with no disruptive circumstances, the law predicts that both genotype and allele frequencies…

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Correct answer: Random mutations

664. The total aggregate of genes in a population at any one time is called population's:

  • A. Genome
  • B. Gene pool
  • C. Genetic group
  • D. Genomic library

Explanation: The total aggregate of genes in a population at any one time is called the population's gene pool.

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Correct answer: Gene pool

665. According to Hardy-Weinberg theorem, frequencies of alleles and genotypes in a population's gene pool remain:

  • A. Mobile in gene pool
  • B. Constant
  • C. Stationary in gene pool
  • D. Constant unless acted upon by agents other than sexual recombination

Explanation: According to Hardy-Weinberg theorem, the frequencies of alleles and genotypes in a population's gene pool remain constant over the…

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Correct answer: Constant unless acted upon by agents other than sexual recombination

666. Which of the following processes had resulted in the production of different breeds of domestic dogs and pigeons?

  • A. Natural selection
  • B. Cross breeding
  • C. Artificial selection
  • D. Self Breeding

Explanation: Artificial selection is the technique used of breeding of domestic animals and plants and preservation of favorable characteristics.

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Correct answer: Artificial selection

667. The unequal ability of individuals to survive and reproduce will lead to a gradual change in a population, with favourable characteristics accumulating over the generations, thus leading to the?

  • A. Struggle for existence.
  • B. Evolution of new species.
  • C. Overpopulation
  • D. Persistence of species.

Explanation: Natural selection results in the accumulation of favourable traits in a population.

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Correct answer: Evolution of new species.

668. The study of fish is called?

  • A. Ornithology
  • B. Entomology
  • C. Ichthyology
  • D. Herpetology

Explanation: The study of fish is called "ichthyology." As a branch of zoology, ichthyology is dedicated to the scientific study of fish, exploring…

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Correct answer: Ichthyology

669. Most of the animal species on Galapagos:

  • A. Live nowhere else on the continent
  • B. Live nowhere else in the world.
  • C. Live everywhere else in the continent.
  • D. Live everywhere else in the world.

Explanation: A particularly puzzling case of geographical distribution was the fauna of the Galapagos Islands.

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Correct answer: Live nowhere else in the world.

670. Three parts of the business _ to be done.

  • A. remains
  • B. remain
  • C. is remain
  • D. do remain

Explanation: The correct answer is 'remain', as it correctly agrees with the plural subject 'Three parts of the business'.

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Correct answer: remain

671. Find the error in following sentence.The package was lying by the front door- a cube shaped carton sealed with tape.

  • A. The package
  • B. Lying
  • C. Door- a cube
  • D. With tape

Explanation: The issue here is not with "door- a cube" per se, but with the punctuation (an en dash) and the compound adjective that follows.

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Correct answer: Door- a cube

672. Each problem consists of three statements. Based on the first two statements, the third statement may be true, false, or uncertain.Battery X lasts longer than Battery Y.Battery Y doesn't last as long as Battery Z.Battery Z lasts longer than Battery X.If the first two statements are true, the third statement is:

  • A. True
  • B. False
  • C. Uncertain
  • D. None of these

Explanation: The first two statements establish that Battery Y has the shortest lifespan.

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Correct answer: Uncertain

673. Statement I: Rural and semi-urban areas in the country have been suffering due to load shedding for quite some time.Statement II: If the government is not able to overcome the power crisis, load-shedding will be extended even to the urban areas.

  • A. Statement I is the cause and statement II is its effect
  • B. Statement II is the cause and statement I is its effect
  • C. Both statements I and II are independent causes
  • D. Both statements I and II are effects of some common causes

Explanation: d) Both statements I and II are effects of some common cause:This option suggests that both statements are consequences or effects of a…

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Correct answer: Both statements I and II are effects of some common causes

674. Statement: A very large number of students have failed in the final high school examination due to faulty questions in one of the subjects.Courses of Action:I. All the students who have failed in the subject should be allowed to take a supplementary examination.II. All those who are responsible for the error should be suspended and an inquiry should be initiated to find out the facts.

  • A. Only I follows
  • B. Only II follows
  • C. Either I or II follows
  • D. Neither I nor II follows
  • E. Both I and II follow

Explanation: The correct answer is Both I and II follow. The presence of faulty questions in the examination paper indicates a significant oversight by…

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Correct answer: Both I and II follow

675. Statements: The Government of country X has recently announced several concessions and offered attractive package tours for foreign visitors.Conclusions:I. Now, more number of foreign tourists will visit the country.II. The Government of country X seems to be serious in attracting tourists.

  • A. Only conclusion I follows
  • B. Only conclusion II follows
  • C. Either I or II follows
  • D. Both I and II follow

Explanation: The government's actions (announcing concessions and packages) are clear evidence of a serious effort to attract tourists (Conclusion II).

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Correct answer: Both I and II follow

676. Directions: In the following question, a number sequence is given with one term missing. Choose the correct term that will continue the same pattern and replace the question mark in the given sequence.17,20,19,22,21,24,23,?

  • A. 22
  • B. 24
  • C. 26
  • D. 2

Explanation: In the given sequence 17, 20, 19, 22, 21, 24, 23, ?, the pattern alternates between adding 3 and subtracting 1.

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Correct answer: 26

677. Acquired characteristics are non-inheritable because they do NOT cause alteration in the

  • A. Cytoplasmic composition of somatic cells
  • B. Cytoplasmic composition of germ cells
  • C. DNA of somatic cells
  • D. DNA of germ cells

Explanation: The correct answer is Option D:DNA of germ cells.Acquired characteristics are changes in an organism's structure or behavior that occur…

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Correct answer: DNA of germ cells

678. The present giraffe has a long neck compared to its ancestors, Lamarck believed it could be due to

  • A. Natural selection
  • B. Inheritance of acquired characteristics
  • C. Isolation
  • D. Specification

Explanation: The inheritance of acquired characteristics is a theory that physiological changes acquired during an organism's lifetime can be passed…

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Correct answer: Inheritance of acquired characteristics

679. Which of the following was proposed by Lamarck in his theory?

  • A. Overproduction
  • B. Struggle for existence
  • C. Natural selection
  • D. Use and disuse of organs

Explanation: According to Lamarckism, the organs which are used extensively develop themselves in a better way and the organs which are not used, lose…

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Correct answer: Use and disuse of organs

680. Most likely people who perform tough manual work can develop:

  • A. thick subcutaneous fat in their palms
  • B. greater quantity of melanin all over the body.
  • C. strong calf muscles
  • D. certain aquired characters

Explanation: Lamark argued that those parts of the body used extensively to cope with the environment become larger and stronger example; black Smith…

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Correct answer: certain aquired characters
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