CBSE Class 12 Biology Evolution MCQs Set 03

Question. According to Darwinism, which option represents the correct sequence of events in the origin of new species?
1 = Natural selection
2 = Variation and their inheritance
3 = Survival of the fittest
4 = Struggle for existence
a) 1, 2, 3, 4
b) 2, 3, 1, 4
c) 3, 4, 1, 2
d) 4, 2, 3, 1

Answer : C

Question. Hardy and Weinberg proposed a principle for
a) Founder’s effect
b) Sewal Wright effect
c) Genetic drift
d) Non-evolving population.

Answer : D

Question. Industrial melanism is an example of
a) mutation
b) Neo-Lamarckism
c) Neo-Darwinism
d) natural selection

Answer : D

Question. The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function. This is an example of
a) analogous organs that have evolved due to convergent evolution
b) analogous organs that have evolved due to divergent evolution
c) homologous organs that have evolved due to convergent evolution
d) homologous organs that have evolved due to divergent evolution.

Answer : A

Question. Common origin of man and chimpanzee is best shown by
a) binocular vision
b) chromosome number
c) dental formula
d) cranial capacity.

Answer : D

Question. Forthcoming generation are less adaptive than the parental generation due to
a) natural selection
b) mutation
c) genetic drift
d) adaptation.

Answer : B

Question. Which of the following is the correct sequence of events in the origin of life?
(i) Formation of protobionts
(ii) Synthesis of organic monomers
(iii) Synthesis of organic polymers
(iv) Formation of DNA-based genetic systems
a) i, ii, iii, iv
b) i, iii, ii, iv
c) ii, iii, i, iv
d) ii, iii, iv, i

Answer : C

Question. Which of the following includes all homologous organs?
a) The wing of butterfly, wings of bird, wings of bats (patagia)
b) The fore limb of frog, wing of bird, and fore limb of rabbit
c) The thoracic leg of cockroach, hind leg of frog, and fore leg of rabbit
d) Wings of bird, wings of bat (patagia), wing of “flying” lizard

Answer : B

Question. Darwin in his “Natural Selection Theory” did not believe in any role of which one of the following in organic evolution ?
a) Parasites and predators as natural enemies
b) Survival of the fittest
c) Struggle for existence
d) Discontinuous variations

Answer : D

Question. “Homo sapiens” implies
a) human race
b) human beings
c) modern man
d) none of these

Answer : B

Question. Adaptive radiation refers to
a) evolution of different species from a common ancestor
b) migration of members of a species to different geographical areas
c) power of adaptation in an individual to a variety of environments
d) adaptations due to geographical isolation.

Answer : A

Question. In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 or 4.5 to 5 kg die. Which type of selection process is taking place?
a) Cyclical selection
b) Directional selection
c) Stabilising selection
d) Disruptive selection

Answer : C

Question. Vertebrate hearts and brains shows
a) Analogy
b) Atavism
c) Homology
d) Adaptive radiation

Answer : C

Question. Jawless fishes were originated around
a) 350 mya
b) 500 mya
c) 320 mya
d) 200 mya

Answer : A

Question. Which of the following is the relatively most accurate method for dating of fossils?
a) Radio-carbon method
b) Potassium-argon method
c) Electron-spin resonance method
d) Uranium-lead method

Answer : C

Question. In a population of 1000 individuals 360 belong to genotype AA, 480 to Aa and the remaining 160 to aa. Based on this data, the frequency of allele A in the population is
a) 0.4
b) 0.5
c) 0.6
d) 0.7.

Answer : C

Question. From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask.
a) CH4, H2, NH3 and water vapor at 800°C
b) CH3, H2, NH4 and water vapor at 800°C
c) CH4, H2, NH3 and water vapor at 600°C
d) CH3, H2, NH3 and water vapor at 600°C

Answer : A

Question. Homo sapiens have evolved in
a) Paleocene
b) Pleistocene
c) Oligocene
d) Holocene

Answer : D

Question. The finch species of Galapagos islands are grouped according to their food sources. Which of the following is not a finch food?
a) Carrion
b) Insects
c) Tree buds
d) Seeds

Answer : A

Question. The cranial capacity was largest among the
a) Peking man
b) African man
c) Java Ape man
d) Neanderthal man

Answer : D

Question. Which of the following are homologous organs?
a) Wings of bird and hands of human
b) Nails of human being and claws in animals
c) Wings of bird and wings of insect
d) Wings of bat and wings of cockroach

Answer : A

Question. Which of the following had the smallest brain capacity?
a) Homo neanderthalensis
b) Homo habilis
c) Homo erectus
d) Homo sapiens

Answer : B

Question. According to fossils discovered up to present time origin and evolution of man started from
a) France
b) Java
c) Africa
d) China.

Answer : C

Question. When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed
a) microevolution
b) co-evolution
c) convergent evolution
d) divergent evolution.

Answer : C