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Class 12 Biology Objective In English Chapter – 7 Genetics and Evolution
1. S.L. Miller is related to
( A ) Origin & Evolution of life
( B ) Use and disuse theory of evolution
( C ) Neo-Darwinism
( D ) Neo-Lamarckism
Answer-( A )
2. Dryopithecus is more similar to
( A ) Ape
( B ) Gorilla
( C ) Chimpanzee
( D ) Man
Answer-( A )
3. Organic evolution was preceded by chemical evolution, the champions of this theory are
( A )A. I. Oparin and J.B.S. Haldane
( B ) Charles Darwin
( C ) Arrhenius
( D )Baptiste Lamarck
Answer-( A )
4. Adaptive radiation in Australian marsupials are example of :
( A ) Divergent Evolution
( B ) Convergent Evolution
( C ) Saltation
( D ) None
Answer-( A )
5. Appearance of antibiotic resistance bacteria is an example of
( A ) Adaptive radiation
( B ) Transduction
( C ) Pre-existing variation
( D ) Divergent Evolution
Answer-( A )
6. It is beleived that earth’s atmosphere before origin of life was consisted of a mixture of :
( A ) CH4, O3 , O2 , NH3
( B ) CH4,NH3, H2, H2O vapours
( C ) CH4 , NH3, CO2, H2
( D ) H2, CO2, H2O, NH2
Answer-( B )
7. The primate which existed 15 mya was
( A ) Homohabilis
( B ) Australopithecus
( C ) Ramapithecus
( D ) Homo errectus
Answer-( C )
8. Which is an example of homology ?
( A ) Eye of octopus and mammals
( B ) Wings of butterfly and birds
( C ) Flippers of penguins and dolphins
( D ) Thorns of Boughainvillea and tendrils of cucurbits
Answer-( D )
9. The brain capacity of Homo erectus was about :
( A ) 650 C.C.
( B ) 900 C.C.
( C ) 1500 C.C.
( D ) 1200 C.C.
Answer-( B )
10. The prebiotic atmosphere of earth was of a reducing nature. It was transformed into an oxidizing atmosphere of present day due to the emergence of:
( A ) Cyanobacteria
( B ) angiosperms
( C ) photosynthetic bacteria
( D) eukaryotic algae
Answer-( A )
11. Non directional alteration in Hardy-Weinberg equilibrium is :
( A ) Gene flow
( B ) Mutation
( C ) Genetic drift
( D ) Gene recombination.
Answer-( C )
12. A gene of operon which forms the repressor protein is :
( A ) Operator
( B ) Promoter
( C ) Regulator
( D ) Structural
Answer-( C )
13. Which one is linked to evolution ?
( A ) Extinction
( B ) Variation
( C ) Reproduction
( D ) Competition
Answer-( B )
14. Dodo is-
( A ) Extinct species
( B ) Endangered species
( C ) Threatened species
( D) All of these
Answer-( A )
15. The earliest hominids evolved about 4 million years ago were :
( A ) Homo erectus
( B ) Neanderthal man
( C ) Cro Magnon man
( D ) Australopithicus
Answer-( D )
16. The first cellular form of life possibly came into existence in :
( A ) 2000 million
( B ) 2000 billion
( C ) 4500 million
( D ) 4.5 billion
Answer-( A )
17. Sweet potato and Potato represent:
( A ) analogous structure
( B ) Divergent evolution
( C ) belong to same ganes
( D) both A & C
Answer-( A )
18. The extinct human ancestor who ate only fruits and hunted with stone weapons was-
( A ) Ramapithecus
( B ) Australopithecus
( C ) Dryopithecus
( D ) Homo errectus
Answer-( B )
19. The most apparent change during the evolutionary history of Homosapiens is traced in :
( A ) Loss of body hair
( B ) walking upright
( C ) shortening of jaws
( D ) remarkable increase in brain size
Answer-( D )
20. The devonian period is considered as
( A ) age of fishes
( B ) age of amphibians
( C ) age of reptiles
( D ) age of mammals
Answer-( A )
21. First life formed on earth was a
( A ) cyanobacterium
( B ) chemoheterotroph
( C ) autotroph
( D ) photoautotroph
Answer-( B )
22. The presence of gillslits in the embryo of all vertebrates, supports the theory of :
( A ) metamorphosis
( B ) biogenesis
( C ) organic evolution
( D ) recapitulation
Answer-( D )
Class 12 Biology Objective In English Chapter – 7 Genetics and Evolution
23. phenomenon of ‘industrial melanism demonstrates :
( A ) geographical isolation
( B ) reproductive isolation
( C ) natural selection
( D ) induced mutation
Answer-( C )
24. Which is not a vestigeal organ in man ?
( A ) Nictiating membrane
( B ) Tail vertebrae
( c ) Vermiform appendix
( D ) Nails
Answer-( D )
25. Major radiation of mammals, birds and pollinating insects took place in which epoch?
( A ) Oegocene
( B ) Eocene
( C ) Pliocene
( D ) Palaeocene
Answer-( D )
26. Golden age of reptiles was:
( A ) Proterozoic era
( B ) Palaeozoic era
( C ) Mesozoic era
( D ) Coenozoic era
Answer-( C )
27. Amphibians were dominant during
( A ) Carboniferous
( B ) Silurian
( C ) Ordovician
( D ) Cambrian
Answer-( A )
28. Coacervates were experimentally produced by :
( A ) Oparin and Sydney Fox
( B ) Fischer and Huxley
( C ) Jacob and Monod
( D ) Urey and Miller
Answer-( A )
29. Chance elimination of alleles from small population is :
( A ) Adaptation
( B ) Genetic drift
( C ) Speciation
( D ) Selection pressure
Answer-( B )
30. Which are immortal ?
( A ) Germ cells
( B ) Liver cells
( C ) Kidney cells
( D ) Neurons
Answer-( A )
31. Discontinuous variations are due to :
( A ) Crossing over
( B ) Mutations
( C ) Segregation of chromosomes
( D ) Independent assortment
Answer-( B )
32. Theory of chemical origin of life was proposed by :
( A ) Miller and Fox
( B ) Oparin and Haldane
( C ) Miller and Watson
( D )Watson and Melvin
Answer-( B )
33. Evolutionary history of an organism is known as:
( A ) Ontogeny
( B ) Phylogeny
( C ) Ancestry
( D ) Palaenotology
Answer-( B )
34. Which one provides most evident proof of evolution ?
( A ) Fossils
( B ) Vestigial organs
( C ) Embryo
( D ) Morphology
Answer-( A )
35. Dinosaurs were present during :
( A ) Palaeozoic
( B ) Precambrian
( C ) Coenozoic
( D) Mesozoic
Answer-( D )
Class 12 Biology Objective In English Chapter – 7 Genetics and Evolution
36.Extra terrestrial origin of life was proposed by
( A ) Catastrophism
( B ) Special creation
( C ) Panspermia
( D ) Sportaneous generation
Answer-( C )
37. Stanley Miller’s expreriment
Supports
( A ) Chemical theory
( B ) Abiogenesis
( C ) Biogenesis
( D ) Pangenesis
Answer-( A )
38. Operon model was proposed was
( A ) Watson & Crick
( B ) Nierenberg
( C ) Jacob & Monad
( D ) None of these
Answer-( C )
39. Echidna is
( A ) Connecting link
( B ) Vestigeal organ
( C ) Extinct link
( D ) None of these
Answer-( A )
