CBSE Class 12 Biology Quiz | CBSE Class 12 Biology MCQs & Answers

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Questions
81 Anti venom against snake poison contains
A antigens
B antigen-antibody complexes
C antibodies
D enzymes

Answer: antibodies
82 The disease chikungunya is transmitted by
A houseflies
B cockroach
C Aedes mosquitoes
D female Anopheles

Answer: Aedes mosquitoes
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83 Opium is extracted from
A Papaver somniferum
B Cannabis sativa
C Atropa belladona
D Erythroxylum coca

Answer: Papaver somniferum
84 Diacetyl morphine is commonly known as
A heroin
B cocaine
C hashish
D ganja

Answer: heroin
85 The immunoglobulin abundant in colostrum, is
A Ig A
B Ig M
C Ig D
D Ig G

Answer: Ig A
86 The letter T in T-lymphocytes refers to
A thymus
B thyroid
C tonsil
D thalamus

Answer: thymus
87 In the immune system, interferons are a part of
A cytokine barriers.
B physical barriers
C physiological barriers
D cellular barriers

Answer: cytokine barriers.
88 The most accepted line of descent in human evolution is [NCERT Exemplar]
A Australopithecus → Ramapithecus → Homo sapiens → Homo habilis
B Homo erectus → Homo habilis → Homo sapiens
C Ramapithecus → Homo habilis → Homo erectus → Homo sapiens
D Australopithecus → Ramapithecus → Homo erectus → Homo habilis → Homo sapiens.

Answer: Ramapithecus → Homo habilis → Homo erectus → Homo sapiens
89 In 1953 S. L. Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from preexisting non-living organic s molecules. The primitive earth conditions created include [NCERT Exemplar]
A low temperature, volcanic storms, atmosphere rich in oxygen
B low temperature, volcanic storms, reducing atmosphere
C high temperature, volcanic storms, non¬reducing atmosphere
D high temperature, volcanic storms, reducing atmosphere containing CH4, NH3 etc.

Answer: high temperature, volcanic storms, reducing atmosphere containing CH4, NH3 etc.
90 Appearance of antibiotic-resistant bacteria is an example of
A adaptive radiation
B transduction
C pre-existing variation in the population
D divergent evolution.

Answer: pre-existing variation in the population
91 The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because [NCERT Exemplar]
A one organism has given rise to another
B they share a common ancestor
C they perform the same function
D they have biochemical similarities.

Answer: they share a common ancestor
92 Analogous organs arise due to
A convergent evolution
B genetic drift
C divergent evolution
D artificial selection

Answer: convergent evolution
93 Which type of selection is industrial melanism observed in moth, Biston bitularia
A Directional
B Artificial
C Stabilising
D Disruptive

Answer: Directional
94 Select the correct statement from the following options.
A Fitness is the end result of the ability to adapt and get selected by nature.
B Darwinian variations are small and direction less.
C Mutations are random and directional.
D All mammals have evolved vivipary as an adaptation.

Answer: Fitness is the end result of the ability to adapt and get selected by nature.
95 Change of frequency of alleles in a population results in evolution. This statement is proposed in
A Hardy-Weinberg principle
B de Vries theory.
C Darwin’s theory
D Lamarck’s theory

Answer: Hardy-Weinberg principle
96 Darwin judged the fitness of individuals by
A dominance over other individuals.
B number of offspring produced.
C ability to defend itself.
D strategy to obtain food.

Answer: number of offspring produced.
97 Homologous organs indicate
A divergent evolution.
B adaptive radiation.
C convergent evolution.
D natural selection.

Answer: divergent evolution.
98 Evolutionary convergence is characterised by
A development of characteristics by random mutations.
B development of similar characteristics in different groups of organisms of different ancestry.
C development of dissimilar characteristics in closely related groups of organisms.
D development of similar characteristics in related groups of organisms.

Answer: development of similar characteristics in different groups of organisms of different ancestry.
99 Intensely lactating mothers do not generally conceive due to the [NCERT Exemplar]
A suppression of gonadotropins.
B hyper secretion of gonadotropins.
C suppression of gametic transport.
D suppression of fertilisation.

Answer: suppression of gonadotropins.
100 The oral contraceptive pills mainly contain the hormones
A estrogen and luteinising hormone.
B progesterone and estrogen.
C estrogens and follicle-stimulating hormone.
D progesterone and follicle-stimulating hormone.

Answer: progesterone and estrogen.

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