NCERT Class 12 Biology General Awareness Questions with Answers

NCERT Class 12 Biology General Awareness Questions with Answers NCERT Class 12 Biology QUESTIONS

NCERT Class 12 Biology General Awareness Questions with Answers

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

Answer: cytokine barriers.
62 ZIFT is transfer of
A zygote into fallopian tube.
B a mixture of sperms and ova into the fallopian tube.
C a mixture of sperms and ova into the uterus.
D embryo into the uterus.

Answer: zygote into fallopian tube.
63 Diaphragms are the contraceptive devices used by females. Choose the correct option about them.
A They are placed to cover the cervix.
B They block the entry of sperms.
C They are reusable.
D All of these.

Answer: All of these.
64 The most accepted line of descent in human evolution is
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
65 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
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.
66 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
67 When ‘Aa’ is crossed with ‘aa’, (A is dominant over a)
A all the offspring will have dominant phenotype.
B all the offspring will have recessive phenotype.
C 50% of offspring will have dominant phenotype and 50% will have recessive phenotype.
D 75% of offspring will have dominant phenotype and 50% will have recessive phenotype.

Answer: 50% of offspring will have dominant phenotype and 50% will have recessive phenotype.
68 The possibility of all genotypes of offspring in a genetic cross is calculated by a graphical representation which was developed by
A Gregor Mendel
B Reginald Punnett
C Komberg
D T.H. Morgan

Answer: Reginald Punnett
69 Study the pedigree chart given Select the correct option about the conclusion.
A It is a sex-linked recessive trait.
B It is an autosomal recessive trait.
C It is an autosomal dominant trait.
D It is a sex-linked dominant trait.

Answer: It is an autosomal recessive trait.
70 Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group respectively. What would be the genotype of both mother and father?
A Mother is homozygous for ‘A’ blood group and father is heterozygous for ‘B’.
B Mother is heterozygous for ‘A’ blood group and father is homozygous for ‘B’.
C Both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively.
D Both mother and father are homozygous for ‘A’ and ‘B’ blood group, respectively.

Answer: Both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively.

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