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 : Biological weed control is not successful because a). Not possible to eradicate weed b). Bioagents are weed specific c). Controlled only introduced weeds d). All of these
Last Answer : d). All of these
Description : An eradication method of weed control a). Killing underground parts of weeds by tillage b). Using soil sterilants c). Repeated foliar application on perennial weeds d). All of these
Description : Integrated weed management practices that a). Enhance crop competitive ability b). Decrease weeds ability to reduce yield c). Practices that eliminate weeds from an area d). Both a and b e). Both a and c
Last Answer : d). Both a and b
Description : The condition intensifies the spread of perennial propagules of weeds after being exposed by tillage a). Hot weather b). Rainfall c). High light intensity d). High wind
Last Answer : b). Rainfall
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 : Weed control index if weed dry weight of a treatment is 200 g/m2 and that of weed check was 600 g/m2 a). 33.3% b). 66.7% c). 25% d). None of these
Last Answer : b). 66.7%
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 : . Mimicry weed in wheat field a). Phalaris minor (Canary grass) b). Wild oat c). Both a and b d). None of these
Last Answer : c). Both a and b
Description : A weed not controlled by clodinafop propargyl in wheat a). Poa annua b). Phalaris minor c). Avena ludoviciana d). Lolium temulentum
Last Answer : a). Poa annua
Description : A nitrogen fixing weed species in wheat a). Lathyrus aphaca b). Medicago denticulata c). Vicia sativa d). All
Last Answer : d). All
Description : The most common weed in wheat a). Avena ludoviciana b). Echinochloa colona c). Panicum dichotomiflorum d). Eleusine indica
Last Answer : a). Avena ludoviciana
Description : Wheat and bajra have critical period of crop-weed competition a).10-20 days b).15-30 days c). 30-45 days d). 20-40 days
Last Answer : c). 30-45 days
Description : National Research Centre for Weed Science (NRCWS), now Directorate of Weed Research (DWR) Jabalpur came into existence on a). 22 April, 1982 b). 22 April, 1985 c). 22 April, 1989 d). 22 April, 1997
Last Answer : c). 22 April, 1989
Description : To devitalize weed seeds in manure, the composting temperature must be in which of the following range a). 35-50 °C b). 50-65 °C c). 65-90 °C d). 90-105 °C
Last Answer : c). 65-90 °C
Description : Herbicide Antidotes a). protect crop plants b). harm crop plants c). Protect weeds d). Harm weeds
Last Answer : a). protect crop plants
Description : The respective storm totals at three surrounding stations A, B and C are 110, 90 and 70 mm. If the normal annual precipitation amounts at stations X, A, B and C are respectively 1000, 1100, 1200 and 1250 mm, the estimated storm precipitation at X is (A) 75 mm (B) 77 mm (C) 79 mm
Last Answer : Answer: Option B
Description : Intra-specific competition is between a). Plants of the cultivated species and weed species b). Plants of the same weed species c). Plants of the different weed species d). None of the above
Last Answer : b). Plants of the same weed species
Description : To control broad-leaved weeds in barley, which of the herbicide is most suitable a). 2,4-D b). Metsulfuron c). Alachlor d). Both a and b
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 : 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 : Commonly used chemical fertilizer to con trol submerged weeds and water bloom non -selectively a). Anhydrous ammonia b). Ammonium sulphate c). Ammonium nitrate d). Urea
Last Answer : d). Urea
Description : Present day versatile herbicide to control difficult, perennial, broadleaved weeds and brushes in grasslands a). Alachlor b). Atrazine c). Picloram d). All
Last Answer : c). Picloram
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 : Which of the weeds are rapidly controlled by MCPA than 2,4-D a). Nutsedge b). Canada thistle c). Both d). None
Last Answer : c). Both
Description : 4. Reverse metabolism induce the suscepti bility to weeds by a). 2,4-D b). MCPA c). Both a and b d). None of these
Description : . Which is the widely used herbicide to con trol broadleaved weeds in winter grains? a). 2,4-D b). MCPA c). Both a and b d). Atrazine
Description : Blind hoeing with bullock/tractor drawn spike-tooth harrow successfully controls weeds in a). Potato b). Sugarcane c). Maize d). Both a and b
Description : Industrial weeds can be controlled by using a). Non selective herbicides b). Selective herbicides c). Soil sterilants d). Both a and c
Last Answer : d). Both a and c
Description : In paddy field which of the following con trols weeds effectively? a). Puddling b). Transplanting c). Manuring d). Both a and b
Description : Which of the weeds make harvesting diffi cult a). Canada thistle b). Cocklebur c). Wild safflower d). All of these
Description : he earliest attempt to control weeds by herbicides was made in 1937 in Pun jab to control Carthamus oxyacantha by using a). Sulfosulfuron b). Atrazine c). Sodium arsenate d). 2,4-D
Last Answer : c). Sodium arsenate
Description : A herbicide for controlling weeds in grassland and pastures a). 2,4-D b). Carfentrazone c). Metsulfuron-methyl d). All
Description : Herbicides are less effective on weeds under which of the soil condition a). Field capacity b). Saturated c). Both a and b d). Dry
Last Answer : d). Dry
Description : Generally weeds seeds are abundant at a depth of a). 1.0-1.5cm b). 5 cm c).10cm d).15cm
Last Answer : a). 1.0-1.5cm
Description : One to two flushes of weeds are destroyed before planting of crop is called a). Stale seed bed b). Blind hoeing c). Weeding d). Summer ploughing
Last Answer : a). Stale seed bed
Description : Percent reduction in yield in case of onion due to weeds is a). 20-30 b). 30-35 c). 60-70 d).15-20
Last Answer : c). 60-70
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 : A practice where one or two flushes of weeds are destroyed before seeding a crop a). Cheeling b). Stale seed bed c). Searing d). None
Last Answer : b). Stale seed bed
Description : In a 100 quadrat study of 1 sqm each Cyperus rotundus was found in 80 quadrats with overall of 5640 individuals. The frequency (%), abun dance and density (m2) would be a). 70.5, 80.0 and 56.4 b). 56.4, 70.5 and 80.0 c). 80.0, 70.5 and 56.4 d). 80.0, 56.4 and 70.5
Last Answer : c). 80.0, 70.5 and 56.4
Description : Amount of Topic 10% for 4000 m2 if rate of clodinafop is 60 g/ha. a). 600 g b). 480 g c). 300 g d). 240 g
Last Answer : d). 240 g
Description : Number of weed species identified in the world a). 30 b). 300 c). 3000 d). 30000
Last Answer : d). 30000
Description : If total income of company B in 2008 was Rs.140 crore, what was the total expenditure of that company in the same year? (approx) a) Rs.100.66 cr. b) Rs.110.33 cr. c) Rs.98.22 cr. d) Rs.94.90 cr. e) Rs.96.55 cr.
Last Answer : e) Rs.96.55 cr.
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 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