Download Question Paper for Competitive Exam : Plant Breeding

MULTIPLE CHOICE QUESTIONS
B.Sc Agriculture (Plant Breeding)
(For Competitive Examination)
Cross pollinated species are also known as____________ species or inbreeders.
A Allogamous
B Cleistogamy
C Chasmogamy
____________ is a progeny of two different single self-pollinated
A
Female parent
B
Pureline
C
D Autogamous
homozygous plants.
Inbred
D
Hybrid
_______________ method of breeding is appropriate for improvement of good variety.
A
Mass Selection
B
Back cross method
C
Heterosis breeding
D
Pure line selection
___________is the newer methods for crop improvement
A
Selection
B
Introduction
C
Hybridization
D
Mutagenesis
D
Introduction
____________ is a general breeding method
A
Hybridization
B
Mutation
C
Distant hybridization
_____________ pollinated crops have heterozygous balance and are not tolerant to inbreeding.
A
Self
B
Cross
C
Often cross
D
Non of all
Mendel theorized that genetic traits are “segregated” during gamete formation and the offspring get
only one gene for a trait from each parent. Why is this important to sexually reproducing organisms?
A
They would get too
many dominant traits
B
They would get too C
many recessive
It allows for
offspring to be
D
It allows the best
traits to be selected
if it did not occur
traits if it did not
occur
different from
their parents
out for the
offspring
Mendel theorized that genetic traits are “independently assorted” and one trait does
not depend on another for transmission to offspring. What do we know today that
makes this theory invalid?
A
Genes on the same
chromosome are
usually transmitted
together.
B
Chromosomes
stick together and
are often
transmitted with
each other.
C
The same gene
may be
responsible for
several different
traits.
D
Transmission of
genes is random
and depends on
laws of probability
C
On the “X”
chromosome
D
On chromosome
pair # 21
Where are genes for sex-linked traits located?
A
They can be on any
chromosome
B
On the “Y”
chromosome
A white flower crossed with a red flower produces pink offspring. This is an example of incomplete
dominance. If two of the pink-flowered plants are crossed, what ratio will the genotypes of the offspring
have?
A
1 RR: 3 Rr
B
1 RR: 2 RR’: 1
R’R’
C
2 Rw: 2 Ww
D
1 Rr: 2 rr: 1 ww
D
there are three
alleles for blood
type and four types
of blood
D
46
Why blood types are considered an example of codominance?
A
there are four types of
blood, not two
B
blood type O can
be donated to
anyone, AB cannot
C
blood types A
and B will both
be expressed
when present
How many pairs of homologous chromosomes do humans have?
A
4
B
23
C
44
If two different alleles are present, which allele is expressed?
A
recessive
B
dominant
C
phenotypic
D
pure
D
seed color
A tall pea plant (DD) and a tall pea plant (Dd) have what in common?
A
phenotype
B
genotype
C
alleles
In crossing homozygous dominant and homozygous recessive pea plants, Mendel
noted that some genes were not seen in the F1 generation and were seen in only 25%
of the F2 generation. What did he call these genes?
A
dominant
B
recessive
C
lethal
D
incompletely
dominant
C
Both
D
None
Cross pollinated
C
Clone
D
All of these
Pureline selection
C
Clonal selection
D
All of these
C
Clone
D
Multilines
Continuous inbreeding (Selfing) leads
A
Homozygosity
B
Hetrozygosity
Composite varieties are developed in crops
A
Selfpollinated
B
Broader genetic base is found in
A
Mass selaction
B
Effective selection can be made in
A
Pureline
B
Hybrid
Heterosis results due to complementation between
A
Different genes
B
Divergent alleles
C
Multiple alleles
D
Iso - alleles