CBSE Class 12 Biology Quiz | CBSE Class 12 Biology Multiple Choice Questions(MCQs) & Answers
Questions
1
In an embryo sac, the cells that degenerate after fertilisation are: [NCERT Exemplar]
Answer: Synergids and antipodals.
2
In a fertilised embryo sac, the haploid, diploid and triploid structures are: [NCERT Exemplar]
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]
Answer: Dioecious plant bearing only male or female flowers.
4
Choose the correct statement from the following. [NCERT Exemplar]
Answer: Cleistogamous flowers always exhibit autogamy.
5
Autogamy can occur in a chasmogamous flower if [NCERT Exemplar]
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]
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
Answer: 500
8
When the pollen of a flower is transferred to the stigma of another flower on the same plant, the process is known as
Answer: geitonogamy
9
The development of fruits without fertilisation of the ovary, is called
Answer: parthenocarpy
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?
Answer: Pentaploid
11
Which of the following represents the female gametophyte in angiosperms?
Answer: Embryo sac
12
How many microspore mother cells are required to produce 1000 microspores/pollen grains?
Answer: 250
13
Identify the correct sequence of events.
Answer: Gametogenesis → Syngamy → Zygote
14
Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because [NCERT Exemplar]
Answer: nodes have meristematic cells
15
There are various types of reproduction. The type of reproduction adopted by an organism depends on [NCERT Exemplar]
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]
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]
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]
Answer: haploid vegetative cells and haploid gametangia
