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NCERT - Class 12 Biology Questions and Answers from Chapter "Evolution" | GkSeries

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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Evolution of Biology
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(1) The process by which organisms with different evolutionary history evolve similar phenotypic adaptations in response to a common environmental challenge, is called
[1] Natural selection
[2] Convergent evolution
[3] Non-random evolution
[4] Adaptive radiation
Answer: Convergent evolution
(2) The concept of chemical evolution is based on
[1] Possible origin of life by combination of chemicals under suitable environmental conditions
[2] Crystallization of chemicals
[3] Interaction of water, air and clay under intense heat
[4] Effect of solar radiation on chemicals
Answer: Possible origin of life by combination of chemicals under suitable environmental conditions

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(3) The tendency of population to remain in genetic equilibrium may be disturbed by
[1] Random mating
[2] Lack of migration
[3] Lack of mutations
[4] Lack of random mating
Answer: Lack of random mating
(4) One of the important consequences of geographical isolation is:
[1] Random creation of new species
[2] No change in the isolated fauna
[3] Preventing Speciation
[4] Speciation through reproductive isolation
Answer: Speciation through reproductive isolation
(5) Homologous organs indicate the
[1] Convergent evolution
[2] Parallel evolution
[3] Common descendent
[4] Natural selection
Answer: Common descendent
(6) Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as
[1] Genetic flow
[2] Genetic drift
[3] Random mating
[4] Genetic load
Answer: Genetic drift
(7) Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
[1] Overproduction, variations, constancy of population size, natural selection
[2] Variations, constancy of population size, overproduction, natural selection
[3] Overproduction, constancy of population size, variations, natural selection
[4] Variations, natural selection, overproduction, constancy of population size
Answer: Overproduction, constancy of population size, variations, natural selection
(8) A baby has been born with a small tail. It is the case exhibiting
[1] atavism
[2] mutation
[3] retrogressive evolution
[4] metamorphosis
Answer: atavism
(9) Diversification in plant life appeared:
[1] Due to abrupt mutations
[2] Suddenly on earth
[3] By seed dispersal
[4] Due to long periods of evolutionary changes
Answer: Due to long periods of evolutionary changes
(10) What is common to whale, seal and shark?
[1] Homeothermy
[2] Seasonal migration
[3] Thick subcutaneous fat
[4] Convergent evolution
Answer: Convergent evolution
(11) Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary period for different groups of organisms, includes
[1] study of carbohydrates/proteins in fossils
[2] study of the conditions of fossilization
[3] Electron Spin Resonance (ESR) and fossil DNA
[4] study of carbohydrates/proteins in rocks
Answer: Electron Spin Resonance (ESR) and fossil DNA
(12) Chemical reactions could have converted simple organic compounds into ______ for the origin of life.
[1] Micromolecules
[2] Nitrogen, oxygen and other gases
[3] Cells
[4] Macromolecules
Answer: Macromolecules
(13) What is meant by the term Darwin fitness?
[1] The ability to survive and reproduce
[2] High aggressiveness
[3] Healthy appearance
[4] Physical strength
Answer: The ability to survive and reproduce
(14) De Vries gave his mutation theory on organic evolution while working on -
[1] Oenothera lamarckiana
[2] Drosophila melanogaster
[3] Pisum sativum
[4] Althea rosea
Answer: Oenothera lamarckiana
(15) Coacervates were experimentally produced by______.
[1] Fischer and Huxley
[2] Sidney Fox and Oparin
[3] Urey and Miller
[4] Jacob and Monod
Answer: Sidney Fox and Oparin

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