Description : Which is non – selective herbicide ? a). Glyphosate b). Fluchloralin c). 2,4-D d). Propanil
Last Answer : a). Glyphosate
Description : Which is Post emergence herbicide ? a). Propanil b). Fluchloralin c). Alachor d). Thiobencarb
Last Answer : a). Propanil
Description : Butachlor has to be applied to control weeds in upland rice at a). Immediately after sowing b). 2 DAS c). 6-8 DAS d). 15 DAS
Last Answer : d). 15 DAS
Description : . A non-competitive crop requiring weed free period of three or more months a). Maize b). Rice c). Soybean d). Onion
Last Answer : d). Onion
Description : Complete crop failure is caused in which of the following crops a). Vegetables b). Upland rice c). both a and b d). Wheat
Last Answer : c). both a and b
Description : . A crop has residual allelopathy on wheat a). Rice b). Lentil c). Maize d). Sorghum
Last Answer : b). Lentil
Description : A herbicide applied to the soil before planting a crop is called a a). pre-emergence b). Post-emergence c). Pre-plant d). None
Last Answer : c). Pre-plant
Description : Most widely used post-emergent herbicide in rice is (a) Stomp(b) Basaline (c) Atrazine (d) Propanil
Last Answer : (d) Propanil
Description : When the weeds are under pressure, the herbicides enter the leaf a). less readily b). more readily c). do not enter d). entry not affected
Last Answer : a). less readily
Description : A broad-leaf herbicide in wheat a). Carfentrazone – ethyl 20 g/ha b). Metsulfuron – methyl 4 g/ha c). 2,4-D 500 g/ha d). All
Last Answer : d). All
Description : Devine produce lethal root and collar rot in a).Velvet leaf b). Joint vetch c). Strangler wine d). Dodder
Last Answer : c). Strangler wine
Description : Tolerance of the rice plants to molinate is due to a).Reverse metabolism b). Protoplasmic resistance c). Conjugation d). Slow translocation
Last Answer : b). Protoplasmic resistance
Description : The crops known for autotoxicity a). Lucerne and wheat b). Berseem and oats c). Rice and soybeans d). None of these
Last Answer : a). Lucerne and wheat
Description : Which of the safeners counteract inhibition of synthesis of very long chain fatty acids in rice by pretilachlor and metolachlor a). Fenclorim b). Benoxacor c). Fluxofenim d). All
Description : Early post-emergence treatment is followed in a). Potato b). Sugarcane c). Both a and b d). Rice
Last Answer : c). Both a and b
Description : . Mimicry weed in rice field is a). Wild rice (Oryza sativa var fatua) b). Echinochloa colona c). Echinochloa crusgalli d). All of these
Last Answer : d). All of these
Description : Scheme for testing the field performance of hrbicidies in rice, wheat and sugarcane in different states of India by ICAR was initi ated in a). 1948 b). 1952 c). 1956 d). 1960
Last Answer : b). 1952
Description : . A common weed of lowland rice a). Phalaris minor b). Avena fatua c). Monochoria vginalis d). Lolium temulentum
Last Answer : c). Monochoria vginalis
Description : .____________ is a selective post – emergence herbicide used for weed control in rice a). Bispyribac-sodium b). Butachlor c). Pretilachlor d). Atrazine
Last Answer : a). Bispyribac-sodium
Description : The term, allelopathy was given by a). Rice b). Molisch c). Decondole d). Democritus
Last Answer : b). Molisch
Description : The term allelopathy was given by a). Rice (1974) b). Molisch (1937) c). Decondole (1832) d). Molisch (1930)
Last Answer : b). Molisch (1937)
Description : Percent reduction in grain yield of transplanted rice due to weeds is a). 20-40 b).10-30 c).15-20 d).15-45
Last Answer : d).15-45
Description : Phalaris minor has developed resistance to isoproturon in Punjab and Haryana in a). Rice b). Wheat c). Sugarcane d). Cotton
Last Answer : b). Wheat
Description : Striga densiflora and Orobanche aegyptica are the weeds of a). Rice and Wheat b). Sugarcane and Mustard c). Wheat and Sugarcane d). Oats and Rice
Last Answer : b). Sugarcane and Mustard
Description : Which is the ‘odd one’ based on mimicry a). Wild rice in rice b). Wild sorghum in sorghum c). Wild sugarcane in sugarcane d). Itch grass in upland rice
Last Answer : d). Itch grass in upland rice
Description : To manage grassy weed flora in barley which of the herbicides is to be applied a). Pendimethalin b). Isoproturon c). a and b d). Metsulfuron
Last Answer : c). a and b
Description : To manage mixed weed flora in barley which of the herbicides is to be applied a).2,4-D b). Isoproturon c). a and b as tank mix d). None of these
Last Answer : c). a and b as tank mix
Description : Which of the following pre-emergence her bicides can be applied with herbicides that have efficacy with emerged weeds a). Chloracitamide b). Thiocarbamates c). Dinitroanilines d). All
Description : A herbicide tolerant to lucerne and can be applied mixed with seed is a). EPTC b). Benefix c). Pendimethalin d). None of these
Last Answer : a). EPTC
Description : .Atrazine recommended to be applied as _________application in maize a). Pre-emergence b). Early post-emergence c). Post-emergence d). All of the above
Last Answer : d). All of the above
Description : .Atrazine recommended to be applied as ____________application in maize a). Pre-emergence b). Early post-emergence c). Post-emergence d).All of the above
Last Answer : .All of the above
Description : Herbicides prone to photodecomposition such as Trifluralin, monuron, chloramben and PCP should be applied in a). Morning b). Evening c). Afternoon d). all
Last Answer : b). Evening
Description : Which herbicide is pre - plant applied herbicides ? a). Dalapon b). 2,4-D c). Alachlor d). All
Last Answer : a). Dalapon
Description : Change in molecular structure of applied herbicides inside the plant is known as a). Conjugation b). Metabolism c). Reverse metabolism d). Degradation
Last Answer : b). Metabolism
Description : A soil applied herbicide a). Glyphosate b). Paraquat c). 2,4-DB d). Fluchloralin
Last Answer : d). Fluchloralin
Description : If weed population is 70/m2 and the crop 140/ m2, weed intensity would be a). 33.3% b). 66.6% c). 50% d). 73.4%
Last Answer : a). 33.3%
Description : Which of the herbicides can be used in gram crop? a). Pendimethalin b). Metolachlor c). Fluchloralin d). All
Description : A curvilinear relationship between weed density and crop yield was reported by a). Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these
Last Answer : b). Roberts and Bonds (1975)
Description : The sigmoidal relationship between weed density and crop yield was proposed by a).Zimdahl 1980 b). Roberts and Bonds (1975) c). Cousens et al (1985) d). None of these
Last Answer : a).Zimdahl 1980
Description : A period in the ontogeny of crop at which maximum crop weed competition occurs is called a). Economic threshold b). Gain threshold c). Competitive threshold d). None
Last Answer : d). None
Description : The effective solution to manage weed shifts a). Herbicide combinations b). Herbicide rotations c). Crop rotations d). All
Description : The competitive crop requiring weed free period of about 3-4 weeks a). Soybean b). Carrot c). Garlic d). Onion
Last Answer : a). Soybean
Description : . A shortest time span in the life cycle of a crop when weeding results in highest eco nomic returns a). Economic threshold b). Critical period c). Competitive threshold d). None of these
Last Answer : b). Critical period
Description : Trap crop for Cuscuta sp a). Small grains b). Chickpea c). Mustard d). All
Description : Which formulation of 2,4-D has fastest ab sorption by crop plants? a). Ethyl ester b). Dimethylamine c). Na salt d). All
Last Answer : a). Ethyl ester
Description : Persistence herbicides pose hazard in soil when a). High persistence herbicides are used b). Crop failure necessitate re-planting c). Susceptible crop follows a short crop d). All
Description : Trap crop for Orobanche a). Linseed b). Sunhemp c). Chillies d). All of these
Description : . Trap crop for striga is a). Sunflower b). Cotton c). Cowpea d). All of these
Description : November sown berseem crop induces the weed a). Chenopodium sp b). Anagallis sp c). Vicia sp d). All of these
Description : The official peer-reviewed Journal of the EWRS (European Weed Research Society) is a). Journal of Crop and Weed b). Weed Research c). Weed Science
Last Answer : b). Weed Research