Description : Auto allelopathy existed in a). Wheat b). alfaalfa c). cowpea d). all
Last Answer : d). all
Description : Growth of the weed is reduced due to root exudates of maize a). Chenopodium album b). Amaranthus retroflexus c). Both a and b d). None of these
Last Answer : c). Both a and b
Description : . Trap crop for striga is a). Sunflower b). Cotton c). Cowpea d). All of these
Last Answer : d). All of these
Description : The donor plants release allelochemicals in the immediate environment as a). volatiles b). root exudates c). microbial decomposition products d). All
Last Answer : d). All
Description : Root exudates of wheat and oats which has detrimental effects on wild mustard con tain a). Phenolic acid b). Alkaloids c). Sulphides d). Lactones
Last Answer : a). Phenolic acid
Description : .Phenolic acid as root exudates of which crop has detrimental effects on wild mustard? a). Wheat b). Oats c). Chickpea d). a & b
Last Answer : d). a & b
Description : Root exudates of which crop has allelo pathic effect on Chenopodium album? a). Wheat b). Oat c). Pea d). All
Description : In which of the weed the underground sys tem is located deeper than one metre? a). Cyperus rotundus b). Sorghum halepense c). Pluchea lanceolata d). All of these
Description : Weed species wgich can tolerate so larisation effect a). Phalaris minor b). Sorghum halepense c). Alopecurus myosuroides d). Lolium temulentum
Last Answer : b). Sorghum halepense
Description : Weed responsible for forest fire is a). Aligator weed b). Sorghum halepense c). Lantana d). Amaranthus
Last Answer : c). Lantana
Description : C4 weed a). Avena fatua b). Lolium temulentum c). Sorghum halepense d). Phalaris minor
Last Answer : c). Sorghum halepense
Description : .Which crop is an indicator plant for the bio assay of Triazines and Aliphatics? a). Sugarbeet b). Sorghum c). Cotton d). Mustard
Last Answer : a). Sugarbeet
Description : Continuous cropping of which legume crop cause auto allelopathy? a). Chickpea b). Alfa-alfa c). Cowpea d). Pigeonpea
Last Answer : b). Alfa-alfa
Description : . Klamath weed (Hypericum perforatum) is controlled by an insect a). Chrysolina hyperici (Beetle) b). Chrysolina gamellata (Beetle) c). Agrilus hyperici (Root borer) d). All of these
Description : The weed propagated through rhizomes/ root stock a). Agropyron repens b). Cynodon dactylon c). Typha angustata d). All of these
Description : In India, Striga is a problem of a). Sorghum b). Pearlmillet c). Both d). None
Last Answer : c). Both
Description : . Herbicide effectively controls Saccharum and Sorghum halepense only at pre flowering stage a). Diuron b). Atrazine c). Amitrole d). Both a and c
Last Answer : d). Both a and c
Description : .Which indicator plant is used in germi nation test of bioassay? a). Cucumber b). Sorghum c). Oat d). All
Description : .Sorghum is bioassay species for which group of herbicide? a). Dinitroanilines b). Dicamba c). Triazines d). a & b
Description : Which crop exhibit direct allelopathy? a). Sorghum b). Maize c). Lentil d). Alfalfa
Last Answer : a). Sorghum
Description : . A crop has residual allelopathy on wheat a). Rice b). Lentil c). Maize d). Sorghum
Last Answer : b). Lentil
Description : .Which among the following crops ex hibits allo-allelopathy? a).Maize b). Sorghum c). Rye d). All
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 : Semi root parasitic weed of Sorghum and Sugarcane?
Last Answer : Ans.Striga spp.
Description : If Echinochloa falls in frequency class ‘E’, the weed community is said to be a). Contiguous b). Heterogenous c). Homogenous d). Random
Last Answer : c). Homogenous
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 : If the count of Echinochloa in weedy check is 70 and that in a treatment 25/m2, weed control efficiency will be a). 54.3% b). 64.3% c). 73.4% d). 79.6%
Last Answer : b). 64.3%
Description : If the yield from weed free is 3500 kg and that from weedy 1500 kg/ha, weed index would be a). 57.1% b). 133.3% c). 45.0% d). 25.6%
Last Answer : a). 57.1%
Description : . A ceremonial weed a). Cynodon dactylon b). Datura stramonium c). Tagetus sp d). All of these
Description : A ceremonial weed a). Asparagus racemosus (Shatawari) b). Cynodon dactylon (Dhoob ghaas) c). Nelumbo nucifera (Lotus flower) d). All of these
Description : A ceremonial weed a). Asparagus racemosus (Shatawari) b). Cynodon dactylon (Dhoob ghaas) c). Both a and b d). Digitaria sanguinalis
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 : A herbicide requiring good spray coverage of all foliage for effective control of a weed population a).Paraquat b). Glyphosate c). Atrazine d). Isoproturon
Last Answer : a).Paraquat
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 weed accumulate over 550 ppm of Zn in its dry matter a). Digitaria b). Setaria lutescens c). Portulaca d). Chenopodium
Last Answer : b). Setaria lutescens
Description : A natural pre-emergence weed control in turf grass a). Corn gluten meal b). Bialaphos c). Sulcotrione d). Cinmethylin
Last Answer : a). Corn gluten meal
Description : With poor weed management, a field could shift to a). Predominant weed species b). Species not effectively controlled c). Species not responded to control meas ures d). All the above
Last Answer : d). All the above
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 : 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 noxious weed of South India a). Cynodon b). Cyperus c). Wild brinjal d). All
Description : Herbicide which increase tuber size be sides weed control in potato a). EPTC b). Fluchloralin c). Pendimethalin d). Atrazine
Last Answer : a). EPTC
Description : Largest pre-emergence herbicide for weed control in citrus and pineapple orchards a). Atrazine b). Metham c). Allyl d). All
Last Answer : b). Metham
Description : A very potent herbicide for the control of perennial, broad-leaved weed and brushes a). Atrazine b). 2,4-D c). Picloram d). Amitrole
Last Answer : c). Picloram
Description : Effective rate (kg/ha) of 2,4-D for weed control a). 0.2-0.5 b). 0.5-1.0 c). 2 d). 5
Last Answer : b). 0.5-1.0
Description : Direct contact herbicide application can be achieved by a). Re-circulating sprayer b). Weed wick wiper c). Roller applicator d). All
Description : Important quality of bioagents a). Attack only host plant b). Free from predators/parasites and quick adoption to new environment c). Able to kill reproductive parts of weed d). All of these