Male Sterility in Crop Plants
Time Left
--:--:--
A-
A+
Switch Full Screen
Question No. 1
Marks
+1
-0
Time
0:00
☰
What is a key consequence of male sterility in flowering plants?
A.
Leads to self-pollination
B.
Increases homozygosity
C.
Promotes cross-pollination
D.
Reduces seed formation
Question No. 2
Marks
+1
-0
Time
0:00
☰
Which type of gene is most often responsible for genetic male sterility?
A.
Multiple dominant genes
B.
Single recessive gene
C.
Mitochondrial gene
D.
Cytoplasmic gene
Question No. 3
Marks
+1
-0
Time
0:00
☰
What are the A and B lines used for in hybrid seed production involving GMS?
A.
A for seed storage, B for transport
B.
A for insect resistance, B for drought tolerance
C.
A as sterile female, B to maintain sterility
D.
A for photosynthesis, B for respiration
Question No. 4
Marks
+1
-0
Time
0:00
☰
In cytoplasmic male sterility, the sterility trait is inherited through which part?
A.
Nuclear DNA
B.
Chloroplast
C.
Mitochondria
D.
Ribosomes
Question No. 5
Marks
+1
-0
Time
0:00
☰
What is a disadvantage of GMS in hybrid seed production?
A.
Always dominant gene expression
B.
Inability to maintain sterile line
C.
Sterility reverses under specific conditions
D.
Fertile plants outnumber sterile ones
Question No. 6
Marks
+1
-0
Time
0:00
☰
Which of the following is not a type of male sterility?
A.
Cytoplasmic
B.
Genetic
C.
Photoperiodic
D.
Transgenic
Question No. 7
Marks
+1
-0
Time
0:00
☰
How is a genetic male sterile line typically maintained?
A.
By self-pollination of sterile plants
B.
By cloning the sterile plants
C.
By crossing sterile plants with heterozygous fertile plants
D.
By using chemical mutagens annually
Question No. 8
Marks
+1
-0
Time
0:00
☰
Which of these crop families includes a plant with cytoplasmic-genetic male sterility?
A.
Rosaceae
B.
Brassicaceae
C.
Gramineae
D.
Fabaceae
Question No. 9
Marks
+1
-0
Time
0:00
☰
What effect does male sterility have on the breeding system of plants?
A.
It enhances autogamy
B.
It allows seedless fruit development
C.
It favors cross-pollination
D.
It suppresses flowering
Question No. 10
Marks
+1
-0
Time
0:00
☰
In which condition might genic male sterility in rice be reversed?
A.
High humidity
B.
Short daylight
C.
Temperature below 23°C
D.
Excessive irrigation
Question No. 11
Marks
+1
-0
Time
0:00
☰
Which type of male sterility involves both nuclear and cytoplasmic genes?
A.
Genetic
B.
Thermo-sensitive
C.
Cytoplasmic genetic
D.
Induced
Question No. 12
Marks
+1
-0
Time
0:00
☰
What kind of inheritance is typically observed in CMS?
A.
Paternal
B.
Biparental
C.
Maternal
D.
Autosomal dominant
Question No. 13
Marks
+1
-0
Time
0:00
☰
What is the role of B line in a GMS-based hybrid program?
A.
Acts as pollinator to restore fertility
B.
Maintains fertility in hybrids
C.
Used to develop A line through mutation
D.
Maintains sterile line through crosses
Question No. 14
Marks
+1
-0
Time
0:00
☰
Which chemical is known to induce cytoplasmic male sterility?
A.
Ethidium bromide
B.
Acetone
C.
Silver nitrate
D.
Sulfuric acid
Question No. 15
Marks
+1
-0
Time
0:00
☰
Why is CGMS preferred over GMS in hybrid seed production?
A.
It produces more viable seeds
B.
It does not require removal of fertile plants
C.
It uses nuclear-only inheritance
D.
It is not affected by climate
Question No. 16
Marks
+1
-0
Time
0:00
☰
What is a unique advantage of cytoplasmic male sterility (CMS) over GMS?
A.
It depends on environmental factors
B.
It produces only fertile offspring
C.
It does not require B line for maintenance
D.
It is stable across environments
Question No. 17
Marks
+1
-0
Time
0:00
☰
Why is a restorer line necessary in CMS-based hybrid seed production?
A.
To increase seed viability
B.
To restore male fertility in F1 generation
C.
To maintain cytoplasmic traits
D.
To eliminate female sterility
Question No. 18
Marks
+1
-0
Time
0:00
☰
Which types of lines are involved in CGMS system?
A.
A, B, and R lines
B.
X, Y, and Z lines
C.
Sterile and fertile lines only
D.
B and C lines only
Question No. 19
Marks
+1
-0
Time
0:00
☰
Which factor distinguishes CGMS from CMS?
A.
Use of environmental triggers
B.
Interaction with nuclear genes
C.
Use of pesticides
D.
Application in monocots only
Question No. 20
Marks
+1
-0
Time
0:00
☰
Which crop propagation method allows the use of CMS despite its limitations in seed production?
A.
Grafting
B.
Vegetative propagation
C.
Seed drilling
D.
Hydroponics
Question No. 21
Marks
+1
-0
Time
0:00
☰
Which chemical has been used successfully as a gametocide in rice?
A.
Ethanol
B.
Zinc methyl arsenate
C.
Potassium nitrate
D.
Calcium chloride
Question No. 22
Marks
+1
-0
Time
0:00
☰
What is a major limitation of chemically induced male sterility?
A.
It requires DNA sequencing
B.
It is irreversible
C.
It affects both pollen and ovule
D.
It may result in inconsistent sterility
Question No. 23
Marks
+1
-0
Time
0:00
☰
Why are chemically induced male sterile lines not always practical for large-scale use?
A.
They produce too many seeds
B.
They require genetic modification
C.
They involve complex cytoplasmic-nuclear interactions
D.
They are costly and require repeated treatments
Question No. 24
Marks
+1
-0
Time
0:00
☰
What is a desirable property of an ideal male gametocide?
A.
Permanent genetic change
B.
Causes flower abortion
C.
Selective for male sterility without affecting ovules
D.
Requires daily application
Question No. 25
Marks
+1
-0
Time
0:00
☰
Which method offers the fastest way to induce male sterility in a crop?
A.
Mutagenesis
B.
Backcross breeding
C.
Chemical gametocides
D.
Tissue culture
Question No. 26
Marks
+1
-0
Time
0:00
☰
What is the primary function of the barnase gene in transgenic male sterility?
A.
Enhances seed size
B.
Triggers pollen formation
C.
Induces male sterility
D.
Suppresses ovule development
Question No. 27
Marks
+1
-0
Time
0:00
☰
How is male fertility restored in transgenic male sterile systems?
A.
By removing the transgene
B.
With chemical sprays
C.
Through temperature regulation
D.
Using the barstar gene in the restorer line
Question No. 28
Marks
+1
-0
Time
0:00
☰
Which male sterility system requires three types of parental lines for hybrid seed production?
A.
CMS
B.
GMS
C.
CGMS
D.
Transgenic sterility
Question No. 29
Marks
+1
-0
Time
0:00
☰
What is one downside of CGMS despite its wide application?
A.
Low environmental stability
B.
Lack of cytoplasmic control
C.
Requirement to maintain three lines
D.
Dependence on photoperiod
Question No. 30
Marks
+1
-0
Time
0:00
☰
Which method involves introducing genes from microorganisms to induce male sterility?
A.
Chemical induction
B.
Mutation breeding
C.
Transgenic male sterility
D.
Cytoplasmic inheritance
Question No. 31
Marks
+1
-0
Time
0:00
☰
What is the expected F2 segregation ratio when genetic male sterility is governed by a single recessive gene?
A.
1 fertile : 3 sterile
B.
3 sterile : 1 fertile
C.
2 fertile : 2 sterile
D.
3 fertile : 1 sterile
Question No. 32
Marks
+1
-0
Time
0:00
☰
Which combination results in a 1:1 sterile to fertile ratio in progeny for GMS?
A.
Selfing of heterozygous plants
B.
Crossing two sterile lines
C.
Backcross of fertile heterozygote with sterile
D.
Crossing two fertile homozygotes
Question No. 33
Marks
+1
-0
Time
0:00
☰
In CMS, what is the result of crossing a sterile female (A line) with a fertile B line?
A.
100% fertile progeny
B.
75% fertile, 25% sterile
C.
50% sterile, 50% fertile
D.
100% sterile progeny
Question No. 34
Marks
+1
-0
Time
0:00
☰
In CGMS, what is required in addition to sterile cytoplasm to express male sterility?
A.
Dominant nuclear genes
B.
Fertile mitochondria
C.
Recessive nuclear genes
D.
Restorer gene
Question No. 35
Marks
+1
-0
Time
0:00
☰
What is the function of the restorer (R) line in hybrid seed production using CGMS?
A.
Suppresses female fertility
B.
Induces cytoplasmic mutations
C.
Restores male fertility in F1
D.
Prevents self-pollination
Question No. 36
Marks
+1
-0
Time
0:00
☰
How is male sterility typically transferred into a new genotype?
A.
Direct chemical application
B.
Pollinating with mutant lines
C.
Repeated backcrossing with target variety
D.
Fertilizing with cytokinin
Question No. 37
Marks
+1
-0
Time
0:00
☰
What does the cross of a male sterile plant with a male fertile plant indicate if all offspring are sterile?
A.
Genetic sterility
B.
Photoperiod sensitivity
C.
Cytoplasmic inheritance
D.
Temperature sensitivity
Question No. 38
Marks
+1
-0
Time
0:00
☰
Which of the following crops has male sterility induced via X-rays?
A.
Cabbage
B.
Tomato
C.
Tagetes erecta
D.
Potato
Question No. 39
Marks
+1
-0
Time
0:00
☰
What is one key feature of cytoplasmic genes in CMS?
A.
Paternally inherited
B.
Recombined during meiosis
C.
Maternally inherited
D.
Autosomal dominant
Question No. 40
Marks
+1
-0
Time
0:00
☰
Which crop has spontaneous genetic male sterility reported in nature?
A.
Sugarcane
B.
Barley
C.
Chickpea
D.
Onion
Question No. 41
Marks
+1
-0
Time
0:00
☰
Which method combines cytoplasm of one species with nucleus of another to induce sterility?
A.
Cloning
B.
Mutation breeding
C.
Interspecific hybridization
D.
Apomixis
Question No. 42
Marks
+1
-0
Time
0:00
☰
What is a limitation of CMS in seed-propagated crops?
A.
It causes incomplete sterility
B.
It affects both male and female gametes
C.
Sterile seeds cannot germinate
D.
F1 plants are also sterile
Question No. 43
Marks
+1
-0
Time
0:00
☰
What distinguishes CGMS from GMS in terms of inheritance?
A.
CGMS is environmentally sensitive
B.
CGMS requires dominant genes only
C.
CGMS is governed by nuclear and cytoplasmic genes
D.
GMS is passed only via pollen
Question No. 44
Marks
+1
-0
Time
0:00
☰
Which is a valid source of male sterility in crop improvement programs?
A.
Foliar sprays
B.
Stomatal closure
C.
Spontaneous mutations
D.
High phosphorus fertilizers
Question No. 45
Marks
+1
-0
Time
0:00
☰
Which condition would confirm CMS during inheritance studies?
A.
F1 progeny with mixed fertility
B.
Backcross producing all fertile plants
C.
F1 all fertile from male sterile × male fertile cross
D.
F1 all sterile from male sterile × male fertile cross
Question No. 46
Marks
+1
-0
Time
0:00
☰
Which of the following is a limitation of using male sterility in hybrid seed production?
A.
Increased self-pollination
B.
Difficulty in identifying male sterile lines before anthesis
C.
Enhanced fertility restoration
D.
Improved pollination efficiency
Submit Test
Mark for Review & Next
Clear Response
‹ Prev
Save & Next ›
📋 Submit Test?
0
Answered
0
Skipped
46
Total
You
cannot
change answers after submission.
Cancel
Submit