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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.
View Answer
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.
View Answer
Answer: Synergid, zygote and primary endosperm nucleus.
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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.
View Answer
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.
View Answer
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.
View Answer
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.
View Answer
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
View Answer
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
View Answer
9
The development of fruits without fertilisation of the ovary, is called
A
apomixis
B
agamospermy
C
parthenocarpy
D
parthenogenesis
View Answer
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
View Answer
11
Which of the following represents the female gametophyte in angiosperms?
A
Embryo sac
B
Endosperm
C
Embryo
D
Synergid
View Answer
12
How many microspore mother cells are required to produce 1000 microspores/pollen grains?
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
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
View Answer
Answer: haploid vegetative cells and haploid gametangia
19
Sugarcane is propagated by
A
stem cutting
B
seeds
C
leaf buds
D
root cutting
View Answer
20
Vegetative propagation in Pistia occurs by
A
offset
B
rhizome
C
sucker
D
runner
View Answer
