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question_answer1)
The term "pureline selection" was first time proposed by
A)
W. L. Johannsen done
clear
B)
Sinnot and Dunn done
clear
C)
Darlington done
clear
D)
Mather done
clear
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question_answer2)
Synonym of pureline selection is
A)
Progeny selection done
clear
B)
Pedigree selection done
clear
C)
Single line selection done
clear
D)
All the above done
clear
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question_answer3)
Regarding mass selection which statement is most suitable
A)
As old as agriculture itself done
clear
B)
Followed by all farmers every year done
clear
C)
Usually practiced in cross pollinated crops done
clear
D)
All the above done
clear
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question_answer4)
Regarding pureline selection which statement is most correct
A)
It is always practiced in self pollinated crops done
clear
B)
In it large number of plants are selected done
clear
C)
In it about 6 years time is taken for the production of a variety done
clear
D)
All the above done
clear
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question_answer5)
Clonal selection technique is not useful for
A)
Sugarcane done
clear
B)
Wheat done
clear
C)
Potato done
clear
D)
Onion done
clear
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question_answer6)
What is the advantage of clonal selection
A)
Varieties developed are stable and easy to maintain done
clear
B)
Hybrid vigour is easily utilized done
clear
C)
Only method to improve clonal crops done
clear
D)
All the above done
clear
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question_answer7)
Technique employed in plant hybridization
A)
Emasculation done
clear
B)
Bagging done
clear
C)
Crossing done
clear
D)
All the above done
clear
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question_answer8)
A combination between an open pollinated variety and inbreed line is called
A)
Double cross done
clear
B)
Top cross done
clear
C)
Synthetic cross done
clear
D)
None of the above done
clear
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question_answer9)
Increased vigour of a hybrid, over the parents resulting from the crossing of genetically unlike organisms is called
A)
Heterosis done
clear
B)
Mutant done
clear
C)
Polyploid done
clear
D)
None of the above done
clear
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question_answer10)
Somatic hybridization of potato and tomato forms
A)
Triticale done
clear
B)
Pomato done
clear
C)
Secale done
clear
D)
Altonia done
clear
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question_answer11)
In somatic hybridization technique, the material generally used is
A)
IAA done
clear
B)
2, 4-D done
clear
C)
Polyethylene glycol done
clear
D)
Starch done
clear
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question_answer12)
A plant breeder wants to develop a disease resistant variety, what he should do first
A)
Hybridization done
clear
B)
Selection done
clear
C)
Production of crop done
clear
D)
Mutation done
clear
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question_answer13)
In polyploid breeding, number of chromosome set
A)
Increases done
clear
B)
Decreases done
clear
C)
There is no effect on the number of chromosome sets done
clear
D)
None of the above done
clear
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question_answer14)
Potato varieties produced for crops are
A)
Haploid (n) done
clear
B)
Diploid (2n) done
clear
C)
Triploid (3n) done
clear
D)
Tetraploid (4 n) done
clear
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question_answer15)
The chromosome number in plants can be increased by
A)
Colchicine treatment done
clear
B)
Heat treatment done
clear
C)
Hormone treatment done
clear
D)
Breeding with their wild varieties done
clear
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question_answer16)
Which one of the following agents is used to induce mutation in higher plants
A)
Red light done
clear
B)
Gamma rays done
clear
C)
Streptomycin done
clear
D)
Dichloromethyl area done
clear
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question_answer17)
Hereditary variations in plants have been produced by the use of [CPMT 1974, 75, 84; NCERT 1983]
A)
X-rays done
clear
B)
Gibberellic acid done
clear
C)
D.D.T. done
clear
D)
Auxins done
clear
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question_answer18)
What is a clone [BHU 1983]
A)
A heterozygote produced by sexual means done
clear
B)
A homozygote produced by asexual means done
clear
C)
A heterozygote produced by asexual means done
clear
D)
A homozygote produced by sexual means done
clear
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question_answer19)
One of the popular method employed in the production of new varieties of plants is [BHU 1988]
A)
Selection and vegetative propagation done
clear
B)
Chemical treatment and selection done
clear
C)
Exposure to radiation and selection done
clear
D)
Selection and hybridization done
clear
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question_answer20)
Who used X-rays for the production of mutations [MP PMT 1988, 96]
A)
Muller done
clear
B)
Leeuwenhoek done
clear
C)
Recawsky done
clear
D)
Hooker done
clear
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question_answer21)
Gene mutation is [MP PMT 1988]
A)
Due to breeding done
clear
B)
Due to linkage done
clear
C)
Due to change in nitrogenous base sequence done
clear
D)
Due to change in sequence of genes present in DNA done
clear
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question_answer22)
In crop improvement programme haploids are of great importance because they [CBSE PMT 1989]
A)
Are useful in studies on meiosis done
clear
B)
Require only about half the amount of chemical fertilizers as compare to diploids done
clear
C)
Give homozygous lines following diploidization done
clear
D)
Grow better under adverse conditions done
clear
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question_answer23)
Mutations are usually induced by [MP PMT 1990]
A)
Alfa rays done
clear
B)
Beta rays done
clear
C)
Gamma rays done
clear
D)
White light done
clear
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question_answer24)
What are micro-mutations [MP PMT 1992]
A)
Union of chromosomes done
clear
B)
Reduction of chromosomes done
clear
C)
Changes in genes done
clear
D)
Polyploidy done
clear
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question_answer25)
Which of the following is most effective chemical mutagene [MP PMT 1992]
A)
Methane done
clear
B)
Guanine done
clear
C)
Carbon tetrasulphide done
clear
D)
Caffeine done
clear
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question_answer26)
Four inbreed lines of maize are crossed. The cross is [EAMCET 1993]
A)
Tetraploid cross done
clear
B)
Double cross done
clear
C)
Dihybrid cross done
clear
D)
Tetrahybrid cross done
clear
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question_answer27)
The process of removing stamens from the flower bud during hybridization is called [MP PMT 1993, 95, 2001; MHCET 2000; CBSE PMT 2001; BHU 2002]
A)
Crossing done
clear
B)
Selfing done
clear
C)
Emasculation done
clear
D)
Caping done
clear
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question_answer28)
The hybrids are generally found to be superior to their parents, it is because of [MP PMT 1993]
A)
Homozygosity done
clear
B)
Hybrid vigour done
clear
C)
Parents are generally weak done
clear
D)
None of these done
clear
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question_answer29)
The Triticum aestivum wheat is [CPMT 1995; MP PMT 1993, 95, 2002; DPMT 2003; BVP 2004]
A)
Haploid (7 chromosome) done
clear
B)
Diploid (14 chromosome) done
clear
C)
Tetraploid (30 chromosome) done
clear
D)
Hexaploid (42 chromosome) done
clear
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question_answer30)
Desired improved variety of economically useful crops are raised by [MP PMT 1994; BHU 2004]
A)
Natural selection done
clear
B)
Hybridization done
clear
C)
Mutation done
clear
D)
Biofertilizer done
clear
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question_answer31)
Mutations caused by mutagenic agents are termed as [EAMCET 1995]
A)
Spontaneous mutations done
clear
B)
Chemical mutations done
clear
C)
Induced mutations done
clear
D)
Chromosomal mutations done
clear
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question_answer32)
Bombay green banana cultivation is the result of [EAMCET 1995]
A)
Mass selection done
clear
B)
Pureline selection done
clear
C)
Clonal selection done
clear
D)
Natural selection done
clear
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question_answer33)
The alkaloid from Colchicum autumnale of Liliaceae induces [EAMCET 1995]
A)
Sterility done
clear
B)
Dormancy done
clear
C)
Cell division done
clear
D)
Polyploidy done
clear
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question_answer34)
Heterosis means [CPMT 1995]
A)
Hybrid vigour done
clear
B)
Hybrids are weak done
clear
C)
Hybrids are weak as well as vigorous done
clear
D)
Hybrids are neither weak nor vigorous done
clear
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question_answer35)
Which one of the following chemical induces polyploidy in plant cells [MP PMT 1992, 96]
A)
2, 4-dichlorophenoxy acetic acid done
clear
B)
Rifampicin done
clear
C)
Cytokinenine done
clear
D)
Colchicine done
clear
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question_answer36)
Which of the following condition is hybrid breakdown [AFMC 1997]
A)
Failure of hybrid adult to produce functional gametes done
clear
B)
Failure of the fusion of ova and sperm plant breed of two species done
clear
C)
Failure of hybrid zygote to develop into an offspring done
clear
D)
None of these done
clear
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question_answer37)
In which crops is the method of mass selection applied [MP PMT 1997]
A)
Cross-pollinated done
clear
B)
Self-pollinated done
clear
C)
Both self and cross-pollinated done
clear
D)
Potato and sugarcane done
clear
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question_answer38)
Plants having similar genotypes produced plant breeding are called [MP PMT 1998]
A)
Clone done
clear
B)
Haploid done
clear
C)
Autopolyploid done
clear
D)
Genome done
clear
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question_answer39)
The reason for vegetatively reproducing crop plants to suit for maintaining hybrid vigour is that [CBSE PMT 1998]
A)
They can be easily propagated done
clear
B)
They have a longer life span done
clear
C)
They are more resistant to diseases done
clear
D)
Once a desire hybrid produced, no changes of losing it done
clear
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question_answer40)
The new varieties of plants are produced by [CBSE PMT 1999]
A)
Selection and hybridization done
clear
B)
Mutation and selection done
clear
C)
Introduction and mutation done
clear
D)
Selection and introduction done
clear
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question_answer41)
Mutations are caused due to [CPMT 1999]
A)
Radioactive mutagens done
clear
B)
Chemical mutagens done
clear
C)
Radiation mutagens done
clear
D)
Change in base sequence done
clear
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question_answer42)
Triticale is the hybrid between wheat and [CBSE PMT 2001]
A)
Maize done
clear
B)
Barley done
clear
C)
Rye done
clear
D)
Bean done
clear
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question_answer43)
Piece of sterile plant tissue to be used for tissue culture under aseptic condition is [Orissa PMT 2002]
A)
Inoculant done
clear
B)
Explant done
clear
C)
Clone done
clear
D)
Somaclone done
clear
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question_answer44)
Superority of hybrid over parent is [BVP 2004]
A)
Heterosis done
clear
B)
Selection done
clear
C)
Hybridized progeny done
clear
D)
Hybrid vigour done
clear
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question_answer45)
Which of the following is generally used for induced mutagenesis in crop plants [CBSE PMT 2005]
A)
X-rays done
clear
B)
UV (260 nm) done
clear
C)
Gamma rays (from cobalt 60) done
clear
D)
Alpha particles done
clear
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