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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.
Which one of the following organisms reproduces sexually only once in its life time?
Banana plant
Mango
Tomato
Eucalyptus
2.
Which of the following is a partial root parasite?
Sandal wood
Mistletoe
Orobanche
Ganoderma
3.
Lichens are the associations of :
bacteria and fungus
algae and bacterium
fungus and algae
fungus and virus
4.
Common indicator organism of water pollution is
Eichhornia crassipes
Escherchia coli
Entamoeba histolytica
Lemna pancicostata
5.
Which of the following is a post-fertilisation event in flowering plants?
Transfer of pollen grains
Embryo development
Formation of flower
Formation of pollen grains
6.
The substance produced by a cell in viral infection that can protect other cells from further infection is:
Serotonin
Colostrum
Interferon
Histamine
7.
Selaginella and Salvinia are considered to represent a significant step towards evolution of seed habit because
female gametophyte is free and gets dispersed like seeds
female gametophyte lacks archegonia
megaspores posses endosperm and embryo surrounded by seed coat
embryo develop in female gametophyte which is retained on the parent sporophyte
8.
Restriction enzyme Eco RI cuts the DNA between bases G and A only when sequence in DNA is
GATATC
GAATTC
GATTCC
GAACTT
9.
From among the sets of terms given below, identify those that are associated with gynoecium.
Stigma, ovule, embryo sac, placenta
Thalamus, pistil, style, ovule
Ovule, ovary, tapetum, embryo sac
Egg, integument, embryo sac, nucellus
10.
A dicotyledonous plant bears flowers but never produces fruit and seeds. The most probable cause for the above situation is
Plant is dioecious and bears only pistillate flowers
Plant is dioecious and bears both pistillate and staminate flowers
Plant is monoecious
The plant is dioecious and bears only staminate flowers.
11.
Who among the following was awarded the Nobel Prize for the development of PCR technique?
Herbert Boyer
Hargovind Khurana
Kary Mullis
Arthur Kornberg
12.
The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to :
quantitative trait
Mendelian trait
polygenic trait
maternal trait
13.
Micro-propagation is :
propagation of microbes in vitro
propagation of plants in vitro
propagation of cells in vitro
growing plants on smaller scale
14.
Lysine and tryptophan are :
proteins
non-essential amino acids
essential amino acids
aromatic and no acids
15.
An explant is:
dead plant
part of the plant
part of the plant used in tissue culture
part of the plant that expresses a specific gene
16.
Given below are a few statements regarding somatic hybridization.Choose the correct statements.
(i)protoplasts of different cells of the same plant are fused
(ii)protoplasts from cells of different species can be fused
(iii)treatment of cells with cellulase and pectinase is mandatory
(iv)the hybrid protoplast contains characters of only one parental protoplast.
(i) and (iii)
(i) and (ii)
(iii) and (iv)
(ii) and (iii)
17.
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
18.
Methanogens do not produce
oxygen
methane
hydrogen sulfide
carbon dioxide
19.
Caffeine is a stimulant present in
Coffee
Tea
Cold drinks
All of the these
20.
Methanogens, growing anaerobically on cellulosic material, produce
Methane
Methane and carbon dioxide
Methane and hydrogen
Methane, carbon dioxide and hydrogen.
21.
Bio fertilisers include:
Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
Blue-green algae, rhizobia and other nitrogen fixings bacteria
Rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
Blue green algae, rhizobia and mycorrhiza fungi
1.
(d)
Eucalyptus
2.
(a)
Sandal wood
3.
(c)
fungus and algae
4.
(b)
Escherchia coli
5.
(b)
Embryo development
6.
(c)
Interferon
7.
(d)
embryo develop in female gametophyte which is retained on the parent sporophyte
8.
(b)
GAATTC
9.
(a)
Stigma, ovule, embryo sac, placenta
10.
(d)
The plant is dioecious and bears only staminate flowers.
11.
(c)
Kary Mullis
12.
(b)
Mendelian trait
13.
(b)
propagation of plants in vitro
14.
(c)
essential amino acids
15.
(c)
part of the plant used in tissue culture
16.
(d)
(ii) and (iii)
17.
(a)
be rapidly pumped back from sedimentation to aeration tank
18.
(a)
oxygen
19.
(d)
All of the these
20.
(d)
Methane, carbon dioxide and hydrogen.
21.
(a)
Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
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