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Free download in PDF CBSE Class 12 Biology Multiple Choice Questions(MCQs) & Answers. Here Gkseries provide Biology Solve Questions and Answers for CBSE Class 12 Students.
(1)
In an embryo sac, the cells that degenerate after fertilisation are: [NCERT Exemplar]
[A]
Synergids and primary endosperm cell.
[B]
Synergids and antipodals.
[C]
Antipodals and primary endosperm cell.
[D]
Egg and antipodals.
Answer: Synergids and antipodals.
(2)
In a fertilised embryo sac, the haploid, diploid and triploid structures are: [NCERT Exemplar]
[A]
Synergid, polar nuclei and zygote.
[B]
Synergid, antipodal and polar nuclei.
[C]
Synergid, zygote and primary endosperm nucleus.
[D]
Antipodal, synergid and primary endosperm nucleus.
Answer: Synergid, zygote and primary endosperm nucleus.
(3)
From among the situations given below, choose the one that prevents both autogamy and geitonogamy. [NCERT Exemplar]
[A]
Monoecious plant bearing unisexual flowers.
[B]
Dioecious plant bearing only male or female flowers.
[C]
Dioecious plant with bisexual flowers.
[D]
Monoecious plant with bisexual flowers.
Answer: Dioecious plant bearing only male or female flowers.
(4)
Choose the correct statement from the following. [NCERT Exemplar]
[A]
Cleistogamous flowers always exhibit autogamy.
[B]
Chasmogamous flowers always exhibit geitonogamy.
[C]
Cleistogamous flowers exhibit both autogamy and geitonogamy.
[D]
Chasmogamous flowers never exhibit autogamy.
Answer: Cleistogamous flowers always exhibit autogamy.
(5)
Autogamy can occur in a chasmogamous flower if [NCERT Exemplar]
[A]
pollen matures before maturity of ovule.
[B]
ovules mature before maturity of pollen.
[C]
both pollen and ovules mature simultaneously.
[D]
both anther and stigma are of equal lengths.
Answer: both pollen and ovules mature simultaneously.
(6)
dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is [NCERT Exemplar]
[A]
plant is dioecious and bears only staminate flowers
[B]
plant is dioecious and bears both pistillate and staminate flowers.
[C]
plant is dioecious and bears only pistillate flowers.
[D]
plant is monoecious.
Answer: plant is dioecious and bears only staminate flowers
(7)
The number of meiotic divisions, required to produce 400 seeds in a pea plant, is
[A]
500
[B]
400
[C]
100
[D]
None of these
(8)
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
(9)
The development of fruits without fertilisation of the ovary, is called
[A]
apomixis
[B]
agamospermy
[C]
parthenocarpy
[D]
parthenogenesis
(10)
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
(11)
Which of the following represents the female gametophyte in angiosperms?
[A]
Embryo sac
[B]
Endosperm
[C]
Embryo
[D]
Synergid
(12)
How many microspore mother cells are required to produce 1000 microspores/pollen grains?
[A]
250
[B]
200
[C]
100
[D]
150
(13)
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
(14)
Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because [NCERT Exemplar]
[A]
nodes have meristematic cells
[B]
nodes have non-photosynthetic cells
[C]
nodes are shorter than intemodes
[D]
nodes are located near the soil
Answer: nodes have meristematic cells
(15)
There are various types of reproduction. The type of reproduction adopted by an organism depends on [NCERT Exemplar]
[A]
morphology and physiology of the organism
[B]
the habitat and morphology of the organism
[C]
the organism’s habitat, physiology, and genetic makeup
[D]
morphology of the organism
Answer: the organism’s habitat, physiology, and genetic makeup
(16)
There is no natural death in single celled organisms like Amoeba and bacteria because [NCERT Exemplar]
[A]
they are microscopic
[B]
parental body is distributed among the offspring
[C]
they reproduce by binary fission
[D]
they cannot reproduce sexually
Answer: parental body is distributed among the offspring
(17)
Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because [NCERT Exemplar]
[A]
gametes of parents have qualitatively different genetic composition
[B]
greater amount of DNA is involved in sexual reproduction.
[C]
sexual reproduction is a lengthy process
[D]
genetic material comes from parents of two different species
Answer: gametes of parents have qualitatively different genetic composition
(18)
A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has [NCERT Exemplar]
[A]
diploid vegetative cells and haploid gametangia
[B]
haploid vegetative cells and haploid gametangia
[C]
diploid vegetative cells and diploid gametangia
[D]
haploid vegetative cells and diploid gametangia
Answer: haploid vegetative cells and haploid gametangia
(19)
Sugarcane is propagated by
[A]
stem cutting
[B]
seeds
[C]
leaf buds
[D]
root cutting
(20)
Vegetative propagation in Pistia occurs by
[A]
offset
[B]
rhizome
[C]
sucker
[D]
runner
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