Evolution Additional Practice Test

12th Standard Zoology — Evolution: Additional Online Practice Test

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What is the estimated age of the solar system and Earth according to radiometric dating of meteorites?

A.3.5 to 3.6 billion years B.4.5 to 4.6 billion years C.1.5 to 2.0 billion years D.5.5 to 5.6 billion years

During which period of the Mesozoic era did the first egg-laying mammals originate?

A.Jurassic B.Cretaceous C.Triassic D.Permian

Which abiotically produced lipid spheres can spontaneously self-assemble into a bilayer in a solution and maintain a distinct internal chemical environment?

A.Coacervates B.Microspheres C.Liposomes D.Protoviruses

Which method of fossil dating is utilized to determine the precise age of a fossil by measuring the decay of radioactive isotopes?

A.Relative dating B.Absolute dating C.Strata dating D.Morphological dating

Which organism serves as a transitional stage or connecting link between the phyla Annelida and Arthropoda?

A.Archaeopteryx B.Peripatus C.Platypus D.Ichthyostega

What term is used to describe the sudden, unexpected appearance of ancestral vestigial organs in a highly evolved organism, such as a human baby born with a tail?

A.Analogous structures B.Atavistic organs C.Homologous structures D.Rudimentary organs

Who propounded the biogenetic law, summarizing that ontogeny briefly repeats or recapitulates phylogeny?

A.Charles Darwin B.Jean Baptiste de Lamarck C.Ernst Von Haeckel D.Hugo de Vries

Jean Baptiste de Lamarck published his evolutionary views and principles in which famous book in 1809?

A.The Origin of Species B.Philosophie Zoologique C.Systema Naturae D.The Descent of Man

What was the main reason dark-winged peppered moths (Biston betularia) became dominant in England after industrialization?

A.They developed resistance to industrial soot and chemical pollutants. B.Lichens grew densely on dark trunks, providing them food. C.Soot-darkened tree trunks and the decline of light lichens allowed them to camouflage. D.High temperatures induced melanic mutations in the moth population.

Q10

Which type of natural selection operates when an environment undergoes gradual changes, shifting the phenotypic peak of a population toward one extreme?

A.Stabilizing selection B.Disruptive selection C.Directional selection D.Centrifugal selection

Q11

Which of the following conditions would prevent a natural population from maintaining Hardy-Weinberg genetic equilibrium?

A.Absence of mutations B.Selective mating among individuals C.Large population size D.Absence of gene migration

Q12

Which fossil ancestor of modern Europeans is famous for its cave paintings, as well as drawing figures on floors and walls?

A.Neanderthal man B.Homo erectus C.Cro-Magnon man D.Australopithecus

Q13

Which of the following is categorized as a post-zygotic isolating mechanism that prevents gene flow between two different species?

A.Seasonal isolation B.Ecological isolation C.Hybrid inviability D.Behavioural isolation

Q14

What type of speciation occurs when biological populations of the same species become geographically isolated from one another by physical barriers like mountains or land separation?

A.Sympatric speciation B.Allopatric speciation C.Parapatric speciation D.Quantum speciation

Q15

Why did the extinction of the Dodo bird of Mauritius Island place the Calvaria tree in imminent danger of coextinction?

A.The Dodo bird was the exclusive pollinator of the Calvaria tree flowers. B.Calvaria tree seeds require the action of stones and digestive juices in the Dodo's gizzard to make their tough endocarp permeable for germination. C.Calvaria trees required the nest debris of Dodos as organic nutrients for seedling growth. D.The Dodo bird protected young Calvaria seedlings from herbivorous insect pests.

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About this Evolution test

This free online practice test covers Evolution from the 12th Standard Zoology (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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