Weed Science Part 2
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Question No. 1
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Which of the following bioherbicides is used against Johanson grass?
A.
Biophos
B.
Devine
C.
Collego
D.
Bipolaris
Question No. 2
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Which organism is responsible for causing stem and leaf blight in weeds, as used in biological control?
A.
Colletotrichum gleosporiodes
B.
Biophos
C.
Phytophthora palinivora
D.
Bipolaris sorghicola
Question No. 3
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Which bioherbicide product contains a suspension of fungal spores of Phytophthora palinivora?
A.
Devine
B.
Bipolaris
C.
Biophos
D.
Collego
Question No. 4
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Which biological control method is used to control weeds using insects?
A.
Biocontrol
B.
Parabiological control
C.
Entomological suppression
D.
Weed biological control
Question No. 5
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Which insect was introduced to control prickly pear (Opuntia vulgaris) in India in 1795?
A.
Cactoblastis cactorum
B.
Dactylopius ceylonicus
C.
Zygrogramma bicolorata
D.
Orthogalumna terebrantis
Question No. 6
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Which insect was introduced to Australia in 1925 to control prickly pear (Opuntia inermis)?
A.
Zygrogramma bicolorata
B.
Cactoblastis cactorum
C.
Neochetina eichhorniae
D.
Orthogalumna terebrantis
Question No. 7
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Which of the following weeds is controlled by introducing a mite Orthogalumna terebrantis from Florida in 1982?
A.
Congress grass
B.
Lantana
C.
Water hyacinth
D.
Prickly pear
Question No. 8
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Which insect was introduced to control water hyacinth in 1983 from Argentina?
A.
Neochetina eichhorniae
B.
Zygrogramma bicolorata
C.
Cactoblastis cactorum
D.
Cryptobagous salvinae
Question No. 9
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Which species of beetle was introduced to control congress grass (Parthenium hysterophorus) in India?
A.
Teleonemia serapalora
B.
Zygrogramma bicolorata
C.
Neochetina eichhorniae
D.
Cactoblastis cactorum
Question No. 10
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Which biological control agent was introduced from Australia to control lantana (Lantana camara) in India?
A.
Ophiomyia lantanae
B.
Cryptobagous salvinae
C.
Teleonemia serapalora
D.
Zygrogramma bicolorata
Question No. 11
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What is the toxic substance found in the fruits and leaves of Lantana camara?
A.
Lantadene A & B
B.
Alkaloids
C.
Nicotine
D.
Phytochemicals
Question No. 12
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What type of weed is categorized as 'rogue weed'?
A.
Volunteer weed
B.
Undesirable crop plants
C.
Other variety plants in the same crop
D.
Absolute weed
Question No. 13
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Which of the following is an example of an 'absolute weed'?
A.
Barley in wheat field
B.
Cyprus rotandus
C.
Congress grass in fields
D.
Volunteer wheat in barley field
Question No. 14
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Which of the following is an example of a volunteer weed?
A.
Congress grass
B.
Barley
C.
Wheat
D.
Fallen seeds of previous crop in field
Question No. 15
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Which weed was introduced to India as an ornamental pond plant in 1896?
A.
Lantana camara
B.
Water hyacinth
C.
Prickly pear
D.
Congress grass
Question No. 16
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What is the main reason for the introduction of the Curculionidae weevil, Cryptobagous salvinae, in India?
A.
Control of prickly pear
B.
Control of congress grass
C.
Control of lantana
D.
Control of water fern
Question No. 17
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Which weed is characterized as 'relative weed' because it is an undesirable crop plant in another crop field?
A.
Cyprus rotandus
B.
Barley in wheat field
C.
Lantana camara
D.
Water hyacinth
Question No. 18
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Which of the following bioherbicides contains fungal spores of *Phylopihora palinivora*?
A.
Collego
B.
Biopolaris
C.
Devine
D.
Biophos
Question No. 19
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What does the bioherbicide Collego contain?
A.
Fungal spores of *Colletotrichum gleosporiodes*
B.
Fermented product of *Streptomyces hygroscopicus*
C.
Fungal spores of *Biopolaris sorghicola*
D.
Mites
Question No. 20
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Which bioherbicide is used against Johnson grass?
A.
Devine
B.
Biophos
C.
Collego
D.
Biopolaris
Question No. 21
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Which of the following is a fermented product of *Streptomyces hygroscopicus*?
A.
Collego
B.
Biophos
C.
Devine
D.
Biopolaris
Question No. 22
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What is the biological control of weeds by insects known as?
A.
Parabiological control
B.
Integrated pest management
C.
Chemical control
D.
Cultural control
Question No. 23
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Which insect was introduced to control prickly pear in Australia?
A.
*DacOlopies ceylonicus*
B.
*Neochetina eichhorniae*
C.
*Cactoblastis cactorum*
D.
*Zygrogramma bicolorata*
Question No. 24
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Where did *DacOlopies ceylonicus* originate?
A.
Argentina
B.
Mexico
C.
Australia
D.
Brazil
Question No. 25
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Which weed was introduced in India as an ornamental pond plant in 1896?
A.
Congress grass
B.
Water fern
C.
Water hyacinth
D.
Lantana
Question No. 26
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Which organisms were introduced to control water hyacinth in India?
A.
*Orthogalumna terebrantis*
B.
*Neochetina eichhorniae* & *N. bruchi*
C.
Both A and B
D.
None of the above
Question No. 27
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When was congress grass first reported in India?
A.
1955
B.
1896
C.
1983
D.
1941
Question No. 28
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Which insect was introduced to control congress grass?
A.
*Cactoblastis cactorum*
B.
*Zygrogramma bicolorata*
C.
*Cryptobagous salvinae*
D.
*Teleonemia serapalora*
Question No. 29
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Which weed contains the toxins lantadene A & B and lancamarene?
A.
Water fern
B.
Lantana
C.
Congress grass
D.
Water hyacinth
Question No. 30
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Which insect was introduced to control lantana?
A.
*Ophiomyia lantanae*
B.
*Teleonemia serapalora*
C.
Both A and B
D.
None of the above
Question No. 31
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When was water fern first observed in India?
A.
1950
B.
1896
C.
1983
D.
1941
Question No. 32
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Which insect was introduced to control water fern?
A.
*Cryptobagous salvinae*
B.
*Zygrogramma bicolorata*
C.
*Teleonemia serapalora*
D.
*Ophiomyia lantanae*
Question No. 33
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Which of the following is an example of an absolute weed?
A.
*Cyperus rotundus*
B.
Barley in a wheat field
C.
C-306 variety in PBW-502 wheat field
D.
Volunteer wheat plants
Question No. 34
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What are relative weeds?
A.
Plants of no economic importance
B.
Other crop plants growing in the main crop field
C.
Other varieties of the same crop
D.
Plants grown from fallen seeds of previous crops
Question No. 35
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What are rogue weeds?
A.
Weeds that are always weeds
B.
Undesirable crop plants in the main crop field
C.
Other varieties of the same crop
D.
Weeds grown from fallen seeds
Question No. 36
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What are volunteer weeds?
A.
Weeds that are always weeds
B.
Undesirable crop plants
C.
Other varieties of the same crop
D.
Weeds grown from fallen seeds of previous crops
Question No. 37
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In which year was *Dactylopius ceylonicus* introduced in India?
A.
1785
B.
1795
C.
1805
D.
1815
Question No. 38
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From which country was *Cactoblastis cactorum* introduced to Australia?
A.
India
B.
Brazil
C.
Mexico
D.
Argentina
Question No. 39
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In which year was *Cactoblastis cactorum* introduced to Australia?
A.
1915
B.
1925
C.
1935
D.
1945
Question No. 40
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What is the common name of *Opuntia vulgaris*?
A.
Water hyacinth
B.
Prickly pear
C.
Congress grass
D.
Lantana
Question No. 41
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What is the common name of *Opuntia inermis*?
A.
Water fern
B.
Lantana
C.
Prickly pear
D.
Congress grass
Question No. 42
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What is the scientific name of water hyacinth?
A.
*Salvinia molesta*
B.
*Eichhornia crassipes*
C.
*Parthenium hysterophorus*
D.
*Lantana camara*
Question No. 43
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In which year was water hyacinth introduced in India?
A.
1886
B.
1896
C.
1906
D.
1916
Question No. 44
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From which state was congress grass first reported in India?
A.
Kerala
B.
Maharashtra
C.
Karnataka
D.
Tamil Nadu
Question No. 45
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In which year was *Zygrogramma bicolorata* introduced for the control of congress grass?
A.
1973
B.
1983
C.
1993
D.
2003
Question No. 46
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What is the scientific name of congress grass?
A.
*Eichhornia crassipes*
B.
*Salvinia molesta*
C.
*Parthenium hysterophorus*
D.
*Lantana camara*
Question No. 47
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What is the scientific name of lantana?
A.
*Salvinia molesta*
B.
*Eichhornia crassipes*
C.
*Parthenium hysterophorus*
D.
*Lantana camara*
Question No. 48
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In which year was *Teleonemia seraphora* introduced for lantana control?
A.
1931
B.
1941
C.
1951
D.
1961
Question No. 49
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From which country was *Teleonemia seraphora* introduced to control Lantana?
A.
India
B.
Brazil
C.
Mexico
D.
Australia
Question No. 50
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What is the scientific name of water fern?
A.
*Eichhornia crassipes*
B.
*Salvinia molesta*
C.
*Parthenium hysterophorus*
D.
*Lantana camara*
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