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Published on: 24/05/2021
QB365 Provides the updated NCERT Examplar Questions for Class 12 Biology, and also provide the detail solution for each and every ncert examplar questions , QB365 will give all kind of study materials will help to get more marks
Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test1.
1st polar body is formed at which state of oogenesis?
1st meiosis
2nd mitosis
1st mitosis
differentiation
2.
Pyramid of energy in aquatic ecosystem is
always straight
always inverted
bell shaped
none of these
3.
Which one of the following pairs is mismatched?
Tundra : permafrost
Savannah : acacia trees
Prairie: epiphytes
Coniferous forest : evergreen trees
4.
Which one of the following statements pertaining to pollutants is correct?
DDT is a non-biodegradable pollutant
excess fluoride in drinking water causes osteoporosis.
excess cadmium in drinking water causes black foot disease.
methyl mercury in water may cause 'Itai Itai' disease.
5.
Amensalism is an association between two species where:
one species is harmed and other is benefitted
one species is harmed and other is unaffected
one species is benefitted and other is unaffected
both the species are harmed
6.
In 2005, for each of the 14 million people present in a country,0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as:
25 millions
17 millions
20 millions
18 millions
7.
Identify the correct statement.
In sexual reproduction, the offspring produced are morphologically and genetically identical to the parent
Zoospores are sexual reproduction structures
In sexual reproduction, a single parent produces offspring with or without the formation of gametes
Conidia are asexual structures in Penicillium.
8.
There are various types of reproduction. The type of reproduction adopted by an organism depends on:
The habitat and morphology of the organism
Morphology of the organism
Morphology and physiology of the organism
The organism's habitat, physiology and genetic makeup
9.
Offsprings formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because:
Sexual reproduction is a lengthy process
Gametes of parents have qualitatively different genetic composition
Genetic material comes from parents of two different species
Greater amount of DNA is involved in sexual reproduction.
10.
Which of the following statements support the view that elaborate sexual reproductive process appeared much later in the organic evolution.
(i) Lower groups of organisms have simpler body design.
(ii) Asexual reproduction is common in lower groups.
(iii) Asexual reproduction is common in higher groups of organisms
(iv) The high incidence of sexual reproduction in angiosperms and vertebrates
(i) and (ii)
(i) and (iii)
(ii) and (iv)
(ii) and (iii)
11.
Nucellar polyembryony is reported in species of
Citrus
Gossypium
Triticum
Brassica
12.
Biolistics (gene-gun) is suitable for
disarming pathogen vectors
transformations of plant cells
constructing recombinant DNA by joining with vectors
DNA fingerprinting
13.
The phenomenon wherein the ovary develops into a fruit without fertilization is called:
Parthenocarpy
Apomixis
Asexual reproduction
Sexual reproduction
14.
In the embryos of a typical dicot and grass, true homologous structures are
Coleorhiza and Coleoptile
Coleoptile and Scutellum
Cotyledons and Scutellum
hypocotyl and radical
15.
Embryo sac is to ovule __________ is to an anther
Stamen
Filament
Pollen grain
Androecium
16.
Mother and father of a person with 'O' blood group have "A" and 'B' blood group respectively. What would be the genotype of both mother and father?
Mother is homozygous for "A" blood group and father is heterozygous for 'B'
Mother is heterozygous for 'A' blood group and father is homozygous for 'B'
Both mother and father are heterozygous for 'A' and 'B' blood group, respectively
Both mother and father are homozygous for "A" and 'B' blood group, respectively
17.
Which one of the following is a marine fish :
Rohu
Hilsa
Catla
Common carp
18.
In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are :
males and females, respectively
females and males, respectively
all males
all females
19.
Micro-propagation is :
propagation of microbes in vitro
propagation of plants in vitro
propagation of cells in vitro
growing plants on smaller scale
20.
Activated sludge should have the ability to settle quickly so that it can
be rapidly pumped back from sedimentation to aeration tank
absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tank
be discarded and anaerobically digested
absorb colloidal organic matter
21.
Methanogens do not produce
oxygen
methane
hydrogen sulfide
carbon dioxide
22.
Choose the correct answer regarding the ZIFT procedure?
Ova collected from a female donor are transferred to the fallopian tube to facilitate zygote formation.
Zygote is collected from a female donor and transferred to the fallopian tube.
Zygote is collected from a female donor and transferred to the uterus
Ova collected from a female donor and transferred to the uterus
23.
In fermentation of dough which is the main gas produced?
Carbon dioxide
Hydrogen
Both (a) and (b)
Methane
24.
Caffeine is a stimulant present in
Coffee
Tea
Cold drinks
All of the these
1.
(a)
1st meiosis
2.
(a)
always straight
3.
(c)
Prairie: epiphytes
4.
(a)
DDT is a non-biodegradable pollutant
5.
(c)
one species is benefitted and other is unaffected
6.
(b)
17 millions
7.
(b)
Zoospores are sexual reproduction structures
8.
(d)
The organism's habitat, physiology and genetic makeup
9.
(b)
Gametes of parents have qualitatively different genetic composition
10.
(c)
(ii) and (iv)
11.
(a)
Citrus
12.
(b)
transformations of plant cells
13.
(a)
Parthenocarpy
14.
(c)
Cotyledons and Scutellum
15.
(c)
Pollen grain
16.
(c)
Both mother and father are heterozygous for 'A' and 'B' blood group, respectively
17.
(b)
Hilsa
18.
(a)
males and females, respectively
19.
(b)
propagation of plants in vitro
20.
(a)
be rapidly pumped back from sedimentation to aeration tank
21.
(a)
oxygen
22.
(b)
Zygote is collected from a female donor and transferred to the fallopian tube.
23.
(a)
Carbon dioxide
24.
(d)
All of the these
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