NCERT Class 12 Biology General Knowledge Questions and Answers

NCERT Class 12 Biology General Knowledge Questions and Answers NCERT Class 12 Biology QUESTIONS

NCERT Class 12 Biology General Knowledge Questions and Answers

111 Homologous organs indicate
A divergent evolution.
B adaptive radiation.
C convergent evolution.
D natural selection.

Answer: divergent evolution.
112 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.
113 When the pollen of a flower is transferred to the stigma of another flower on the same plant, the process is known as
A geitonogamy
B cleistogamy
C autogamy
D xenogamy

Answer: geitonogamy
114 The development of fruits without fertilisation of the ovary, is called
A apomixis
B agamospermy
C parthenocarpy
D parthenogenesis

Answer: parthenocarpy
115 In a breeding experiment, the selected male parent is diploid and the female parent is tetraploid. What will be the ploidy level of the endosperm that will develop after double fertilisation?
A Pentaploid
B Tetraploid
C Diploid
D Triploid

Answer: Pentaploid
116 Which of the following represents the female gametophyte in angiosperms?
A Embryo sac
B Endosperm
C Embryo
D Synergid

Answer: Embryo sac
117 How many microspore mother cells are required to produce 1000 microspores/pollen grains?
A 250
B 200
C 100
D 150

Answer: 250
118 Identify the correct sequence of events.
A Gametogenesis ? Syngamy ? Zygote
B Gametogenesis ? Embryogenesis ? Zygote ? Syngamy
C Gametogenesis ? Zygote ? Syngamy ? Embryogenesis
D Gametogenesis ? Syngamy Embryogenesis ? Zygote

Answer: Gametogenesis ? Syngamy ? Zygote
119 Intensely lactating mothers do not generally conceive due to the
A suppression of gonadotropins.
B hyper secretion of gonadotropins.
C suppression of gametic transport.
D suppression of fertilisation.

Answer: suppression of gonadotropins.
120 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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