Weed Management Test 1 — Agri Master Mind
Isoproturon kill canary grass but does not affect wheat due to the presence of
- Cytochrome enzyme
- Cytokinin
- Cytochrome P-450 enzyme
- Cytochrome A-370 enzyme
Asymmetrical triazine herbicide
- Atrazine
- Simazine
- Metribuzin
- MCPA
Mikania micrantha was introduced in India from
- Brazil
- Japan
- Malaysia
- Australia
Eicchornia crassipes is a
- Absolute weed
- Mesophytic weed
- Aquatic Weed
- Semi-Aquatic Weed
Barley in wheat crop is
- Annual weed
- Rogue weed
- Relative weed
- Absolute weed
Cyperus rotundus is a
- Annual weed
- Biennial weed
- Perennial weed
- Economical weed
Soybean herbicide
- Atrazine
- Simazine
- Metribuzin
- MCPA
Cyperus iria is propogated through
- Stem
- Runners
- Seed
- Root
Alternative host weed for hairy caterpillar in castor is
- Agropyron repens
- Chenopodium album
- Crotolaria
- Echinochloa
Pistia stratiotes is
- Submerged weed
- Marginal weed
- Floating weed
- Emerged weed
Term “interference” given by
- Molisch
- Muller
- Harper
- Heap
Weed with short lived blue coloured flowers
- Erigeron canodensis
- Avena ludoviciana
- Commelina benghalensis
- Echinochloa colona
Weed plants are bleached white because of application of
- Atrazine
- Clodinafop
- Tembitrione
- Pendimethalin
Amount of Topik 10% WP required for 4000 sq m. wheat field if rate of application of Clodinafop is 60g a.i./ha
- 120
- 480
- 240
- 600
Post emergence herbicide for weed management in rice
- Butachlor
- Thiobencarb
- Bispyribac sodium
- Nitrofen
Weed propagating through tubers
- Cirsium arvense
- Cynodon dactylon
- Cyperus rotundus
- Allium vineale
Heap is associated with
- Herbicide Selectivity
- Herbicide Residue
- Herbicide Resistance
- IVI
Highest number of resistant weeds are associated with
- HRAC group 1
- HRAC group 5
- HRAC group 2
- HRAC group 4
Most commonly used method of herbicide application in India
- Sand application
- Cut and stamp
- Spraying
- Band application
Electron transport inhibition in PS II for herbicidal action
- Nitriles
- Phenylureas
- All of these
- Triazines
Biocontrol agent for Pathenium hysterophorus
- Teleonmia scrupulosoa
- Sida latifolia
- Zygogramma bicolorata
- Orsioliella javanica
Ceremonial weed
- Melilotus indica
- Menthe spicata
- Cynodon dactylon
- Chorchorus capsularis
Holo-root parasitic weed
- Loranthus
- Striga
- Orobanche
- Cuscutta
Weeds which has balloon modification
- Acer macrophyllum
- Farsetia hamiltonii
- Physalis minima
- Convolvulus microphyllus
Sulfonylureas came in year
- 1970s
- 1960s
- 1980s
- 1950s
First confirmed occurrence of herbicide resistant strain of weed species in US was associated with
- Lolium rigidium
- Phalaris minor
- Senecio vulgaris
- Amarnathus
Parthenium awareness week in India during August each year is coordinated by
- ICAR-CSSRI Karnal
- ICAR-IARI New Delhi
- ICAR DWR, Jabalpur
- IICAR IIFSR Modipuram
Formulation of 24D which is absorbed faster by plants
- Ethyl ester
- Amine salt
- Na salt
- Isopropyl amine
Fop herbicides belong to
- Triazolopyrimidines
- Cyclohexanediones
- Aryloxy-phenoxy-propionic acids
- Pyrimidinyl-thiobenzoates
High risk herbicides In terms of resistance
- PS I inhibitors
- EPSP Sythase Inhibitors
- ACCase Inhibitors
- PPO Inhibitors
Classic example of narrow window herbicide
- Atrazine
- Butachlor
- Pendimethalin
- 24D
Selectivity Index of atrazine on maize if plant can tolerate it upto 6kg/ha and minimum dose to kill weeds is 1kg/ha
- 1.6
- 16
- 6
- .16
Trade name of Bispyribac Na
- Laudis
- Sempra
- Nominee gold
- Axial
Cactoblastis cactorum is used as bio-control agent against
- Parthenium
- Alligator weed
- Opuntia
- Lanatana
Not correctly matched
- Juglone- Black walnut
- Dhurin-Sorghum
- None of these
- Sesquiterpene- Parhenium
Trade name of Tembotrione herbicide
- Sempra
- Axial
- Laudis
- Nominee gold
Phalaris minor can be controlled by
- 24D
- Atrazine
- Metribuzin
- Pendimethalin
Commelina benghalensis bearing short lived blue coloured flowers
- Dicot
- Pteridophyta
- Monocot
- Spermatophyta
First prominent instance of biochemical mimicry based crop associated weed under Indian perspective is
- Saccharum spontaneous in sugarcane
- Wild rice (Oryza longistaninata) in rice
- Phalaris minor in wheat
- Itch grass (Rottboellea cochinchinensis) in upland rice
Weed with a wing structure for effective dissemination
- Avena fatua
- Phalaris minor
- Acer macrophyllum
- Amaranthus viridis
Weed for curing jaundice
- Leucas aspera
- Amaranthus
- Phyllanthus niruri
- Mikania
Hans Molisch is associated with
- Competition
- Allelomediation
- Allelopathy
- Eutrophication
Dredging is most effective for controlling
- Agrestals
- Parasitic weeds
- Aquatic weeds
- Lantana
Herbicide prone to photodecomposition such as Trifluralin should be applied in
- Morning
- Afternoon
- Evening
- All of these
Unit of LD50
- g/g body weight
- Mg/g body weight
- mg/kg body weight
- g/kg body weight
Napthalic anhydride
- Adjuvant
- Emulsifier
- Safener
- Pellet
Volume of spray fluid in ultra low volume spraying
- 300-500l/ha
- 25-50l/ha
- 2-5l/ha
- 100-150l/ha
First mycoherbicide
- Biomal
- Collego
- Devine
- Bipolaris
Classical strategy of biological approach involves
- Bioherbicides
- Bioassay
- Biocontrol agents
- None of these
Indicator plant for bioassay of Atrazine
- Sorghum
- Millet
- Soybean
- Pulses
Directorate of Weed Research (DWR) Jabalpur came into existence on
- 22 April 1982
- 22 April 1979
- 22 April 1989
- 22 April 1782
First selective herbicide
- Sulfosulfuron
- Atrazine
- DNOC
- 24D
Indian Society of Weed Science was found in
- 1978
- 1958
- 1968
- 1975
WSSA publishes
- Weed Science
- Weed Technology
- All of these
- Invasive plant science and management
Weed which can tolerate soil solarization
- Phalaris minor
- Lolium sp
- Melilotus
- Alopecurus sp
Weed control efficiency if weed dry weight of a treatment is 200 g/m2 and that of weed check was 600 g/m2
- 33.3
- 25
- 66.7
- None of these
If relative frequency, dominance and density values are 6, 5 and 4, respectively, then summed dominance ratio is
- 15
- 7.5
- 5
- 3
The most productive treatment based on weed index values
- 24.2
- 2.2
- -24.2
- -2.2
Epinasty of cotton is used to measure qualitative assay of
- Atrazine
- Diuron
- 24D
- Alachlor
VELGO is used against
- Echinochloa
- Parthenium
- Abutilon
- Cenchrus
Constant physical agitation of the spray liquid during field operations can be minimised by adding
- Surfactants
- Humicants
- Emulsifiers
- Coupling agents
Triallate belong to
- Triazines
- Benzoic
- Thiocarbamates
- Uracils
Action of Paraquat
- Amino acid synthesis inhibition
- Pigment inhibition
- Cell membrane inhibition
- Shoot inhibition
Which of the weed accumulates more phosphrous content of over 3.36%.
- Chenopodium
- Amaranthus
- Digitaria
- Portuluca
Which of the formulations has low leach ability in soils
- EC
- WP
- Granules
- WSC
Acidophiles
- Rumex acetosa
- Sonchus arvensis
- Rumex acetosella
- Agropyron repens
Weeds occurring mainly in the cultivated or otherwise disturbed land have never been found in wild state/stage
- Agrestals
- Apophytes
- Anthropophytes
- Ruderals
herbicide activity of 24D was first reported by
- Pokorny
- Zimmerman and Hitchcock
- Marth and Mitchell
- Heap
Censor mechanism occurs in
- Acer macrophylla
- Xanthomonas
- Argemone Mexicana
- Lantana
Atrazine is
- Contact
- Translocated
- Both
- None
Dynamics of weed community as a whole in a given situation is dealt under
- Autecology
- Persistance
- Synecology
- Fidelity
Tridax procumbens transpiration coefficient is
- 542
- 1108
- 1402
- 674
Apoplast herbicide
- None of these
- Shoot active
- Root active
- Both of these
Weed which posses all kinds of dormancy
- Phalaris minor
- Vicia hirsute
- Avena fatua
- Medicago sativa
Herbicide is a
- Greek word
- Spanish
- Latin
- French
Family of Lantana camara
- Papavaraceaee
- Scrophullaraceae
- Verbenaceae
- Cuscutaceae
Modern weed management written by
- T K Das
- V S Rao
- O P Gupta
- U S Walia
Directorate of Plant Protection, Quarantine and Storage is situated in
- Ludhiana
- Lucknow
- Faridabad
- New Delhi
Multiple resistance was first reported in
- Phalaris minor
- Amaranthus
- Lolium rigidium
- Lolium sp
Animal showing highest seed viability
- Chicks
- Horse
- Calves
- Sheep
Beta oxidase enzyme is not found in
- None of these
- Cereals
- Pulses
- Both of these
24D is applied at
- Seedling stage
- Milking Stage
- Tillering Stage
- Jointing stage
Tolerance in potato to metribuzin is due to
- Altered target site
- Enhanced Degradation
- Conjugation
- Overexpression of target protein
Non-ionic surfactant
- SDS
- Aliquot 4
- S-145
- None of these
Release of chemical compounds that are toxic after chemical modification by microorganisms
- True Allelopathy
- Both of these
- Functional Allelopathy
- None of these
Cynodon dactylon infests in
- 52 crops in 92 countries
- 42 crops in 82 countries
- 40 crops in 80 countries
- 30 crops in 80 countries
Seeds/ plant shed by Orobanche album
- 90000
- 72000
- 100000
- 20000
Emergent weed
- All of these
- Typha angustata
- Typha elephantina
- Hydrilla sp
Tolerance of mustard, groundnut and cotton to trifluralin and nitriles is due to
- Metabolism
- Reverse metabolism
- Differential protoplasmic resistance
- Conjugation
Biolaphos, A microbial allelochemical found in
- Senna obtusifolia
- Sorghum halepense
- Streptomyces hygroscopicus
- Senecio vulgaris
Narrow leaved Dicot
- Amarathus viridis
- Parthenium hysterophorus
- Spergula arvensis
- Solanum nigrum
Dormancy due to deep placement of seed
- Induced
- Innate
- Enforced
- Secondary
Weeds which are Undesirable, troublesome and difficult to control
- Relative weeds
- Rogue
- Pernicious weeds
- Objectionable Weeds
Hay fever, asthama caused by the pollen of
- Brushweed
- Utrica
- Ragweed
- Puncturevine
Inherent characteristic of plant to remain confined to certain places of their preference.
- Niche
- Sociability
- Fidelity
- Persistence
IVI index given by
- Harper
- Muller
- Phillip
- Hans Dobson
Atlantis
- Imazethapyr+pendimethalin
- Metsulfuron methyl +chlorimuron ethyl
- Mesosulfuron methyl +iodosulfuronmethylsodium
- None of these
Algrip in wheat is applied at the rate of
- 1.4 g ai/ha
- 60 g ai/ha
- 4 g ai/ha
- 25 g ai/ha
Leader in wheat is applied at the rate of
- 2.5 g ai/ha
- .25 g ai/ha
- 25 g ai/ha
- None of these
Pulses are selective to pendimethalin due to
- Externally working antidote mediated selectivity
- Chemical selectivity
- Depth protection selectivity
- None of these
A-Rice is tolerant to bensulfuron R- Reverse metabolism is responsible for rice tolerance to bensulfuron
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Conjugation is responsible for selectivity in maize to atrazine R- Glutathione–S-Transferase is responsible for conjugation in maize
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Sugarcane is not tolerant to 24D R- 24D is not slowly translocated in sugarcane
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Tembitrione application results in bleaching in weeds R- It belongs to carotenoid biosynthesis inhibitor
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Paraquat results in cell membrane inhibition R- It belongs to PS I inhibitors
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Metribuzin is selective to soybean R-It is due to depth protection selectivity
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
A-Legumes is tolerant to 24D R-Reverse metabolism is the cause of its tolerance.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Zero tillage increases the population of annual weeds over long term. R- Weeds are not killed by post-emergence herbicide
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
2,4-D in wheat can be applied at any stage. R-2,4-D in wheat is not stage specific herbicide.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Epinasty occurs due to 2,4-D in cotton R- Cotton is extra-sensitive to 2,4-D
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
A-diuron is not selective to cotton R- It is due to chronological selectivity
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
2,4-D Na salt is more prone to volatilization than 2,4-D ester R- 2.4-D ester is more prone to leaching than 2,4-D Na salt
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
A-Phalaris minor has developed resistance to Isoproturon R- It is due to altered target site mechanism
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Glyphosate is a contact herbicide R- Paraquat is a translocated herbicide
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
Paraquat is a zero residual herbicide R- It is adsorbed on soil colloid.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion
- Assertion is true but reason is false
- Both Assertion and Reason are False
In case of combined application of herbicides, application rate can be reduced in which of the following interaction
- Antagonistic
- Synergistic
- Additive
- None
Active toxic material present in the formulation is
- Acid equivalent
- Phytochemical
- Active ingredient
- Surfactant
Production practices that influence weed shift are
- Effectiveness of weed management program
- Interface areas
- Speed of weed shift occurrence
- All
The mode of action of Atrazine is
- Pigment inhibition
- Cell membrane disruption
- Seedling growth inhibition
- Photosynthesis inhibition
Herbicides prone to photodecomposition such as Trifluralin, monuron, chloramben and PCP should be applied in
- Morning
- Evening
- Afternoon
- All