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
114 The development of fruits without fertilisation of the ovary, is called
A apomixis
B agamospermy
C parthenocarpy
D parthenogenesis
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
116 Which of the following represents the female gametophyte in angiosperms?
A Embryo sac
B Endosperm
C Embryo
D Synergid
117 How many microspore mother cells are required to produce 1000 microspores/pollen grains?
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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