MCQs of Weed Management Department of Agronomy College of Agriculture, NAU, Bharuch Q.1. Commelina benghalensis bearing short- of lived blue coloured flowers is a a). Free floating a). Monocot b). Rooted floating b). Dicot c). Rooted submerged c). Spermatophyte d). Emergent Q.11. The partial root parasite d). Pteridophyta a). Cuscuta Q.2. The most systematic method for classify- b). Loranthus ing weeds is based on c). Striga a). Morphology d). Orobanche b). Life history Q.12. A weed with a funnel shaped corolla c). Habitat a). Medicago denticulata d). Phylogenetic b). Vicia sativa Q.3. Simple perennials are reproduced by c). Convolvulus arvensis a). Rhizomes d). Scirpus sp b). Tubers Q.13. A sedge with rhizomes c). Corms a). Commelina obliqua d). Seeds b). Cyperus rotundus Q.4. The first prominent instance of biochemi- c). Scirpus sp cal mimicry based crop associated weed d). Eleocharis under Indian perspective is Q.14. A lowland rice sedge a). Saccharum spontaneous in sugarcane a). Cyperus iria b). Phalaris minor in wheat b). Cyperus difformis c). Wild rice (Oryza longistaninata) in rice c). Cyperus esculentus d). Itch grass (Rottboellea cochinchinen- d). All sis) in upland rice Q.15. The ‘condition influences’ directly plant Q.5. A weed with a trailing stem ability in exploring resources a).Convolvulus arvensis a). Soil density b). Digitaria sanguinalis b). Soil CO2 c). Cuscuta sp c). Soil N d). Cynodon sp d). Soil water Q.6. A weed with a balloon structure for effec- Q.16. Hans Molish is associated with tive dissemination a). Competition a). Physalis minima b). Eutrophication b). Avena fatua c). Allelomediation c). Phalaris minor d). Allelopathy d). Amaranthus viridis Q.17. The natural product explored as com- Q.7. A weed having spines as adaptations mercial herbicide that repel grazing a). glufosinate a). Solanum nigrum b). dicamba b). Solanum xanthocarpus c). cinmethylin c). Parthenium d). all d). Ageratum Q.18. Man associated with ‘Horse Hoeing Q.8. Which of the following causes itching and Husbandry’ inflammation a). Zimdahl Robert L. a). Ammannia baccifera b). Molish b). Solanum nigrum c). Jethro Tull c). Urtica sp d). Aspinall and Milthorpe d). Lantana camara Q.19. Dryland weeds usually have Q.9. Cultivation of water chestnut (Trapa a). deep root bispinosa) is abandoned in India due to b). hairyness a). Lantana camara c). Mucilaginous stem b). Eichhornia d). all c). Mikania micrantha Q.20. A weed poisonous to animals and hu- d). Acacia mearnssi man beings Q.10. Eichhornia crassips is a representative a). Datura metal 1 b). Ammannia baccifera Q.29. Flooding is an effective strategy to con- c). Chenopodium trol d). Urtica sp a). Avena ludoviciana b). Sorghum halepense Q.21. Successful weed management is based c). Cynodon dactylon on d). All a). Knowledge on weed biology e). None b). Survey on the nature of weed problem Q.30. Bioagent for controlling Parthenium c). Whole farm planning hysterophorus d). Removal of weeds before flowering a). Bactra verutana i. a & b ii. b & d iii. c & d iv. All b). Zygogramma bicolorata c). Chrysolira Q.22. A system approach based on whole d). Flea beetle land use planning Q.31. The first rule of weed prevention a). Weed eradication a). Regular survey to identify new weeds b). Weed control b). Destruction of weeds before they set c). Weed prevention d). None seed c). Clean seed Q.23. Weed control aims to putting down d). Clean farm equipments and irrigation weed infestation water a). Already present b). a + future infestations Q.32. A companion crop a). Hairy vetch c). b + introduction from the adjacent b). Winter rye fields c). Cowpea d). Combining the available techniques in d). All the optimum level Q.33. A farming practice influencing weed flo- Q.24. Eradication is possible in following ristic diversity weed situations a). Ageratum conyzoides a). Fertility manipulation b). Phalaris minor b). Crop rotation c). Parthenium hysterophorus c). Intercropping d). All d). Lantana e). None Q.25. Besides providing N Azolla is used for Q.34. Practices using direct radiant energy of weed control in the sun a). Wheat b). Rice a). Soil solarization b). Micro-waves c). Castor c). Flaming d). Linseed Q.26. Azolla pinnata is d). All a). a fern Q.35. Post-plant tillage helps in a). Mixing of manures b). an algae b). Control of weeds c). a gymnosperm d). an angiosperm c). Soil and water conservation d). None Q.27.Spudding involving hand weeding/ e). All hoeing added by a sharp edged sickle is most common in Q.36. Flooding – a worldwide crop husbandry method of controlling weeds in a). Wheat a). Maize b). Sugarcane c). Sesame b). Sugarcane c). Buckwheat d). Rice d). Rice Q.28. Dredging is most effective treatment for e).None controlling Q.37. Inter-culture with bullocks in standing a). Parasitic weeds water b). Lantana a). Rice c). Agrestals b). Sorghum d). Aquatic weeds c). Pearlmillet 2 d). all b). Paraquat Q.38.The first chemical shown to have herbi- c). 2,4-DB cidal activity d). Fluchloralin a). 2,4-D Q.48. A ‘Natural amongst the following b). Bordeux mixture a). Devine c). Paraquat b). Glyphosate d). 2,4- DB c). Potassium chloride Q.39. The herbicidal activity of 2,4-D at the d). 2,4-D first time was reported by a). Hammer and Tukey (1944) Q.49. A mico-herbicide b). Zimmernam and Hitchcock (1942) a). Bt c). Nutman and Blackman (1945) b). Collago d). None c). NPV Q.40. a latest herbicide family d). Zygogramma a). Triazines Q.50. Application of bio-herbicides a). Aerial sprays b). Dinitroanilines b). Cut and paste c). Sulfonyl ureas c). Soil application d). Growth regulators d). All Q.41. The effective control of morphological Q.51. Dab system is successful practical similar Phalaris minor in wheat is strategy in limiting future weed infestation achieved with in a). 2,4-D a). Xerophytic environments b). Glyphosate b). Rainfed areas c). Metsulfuron - methyl c). Water-logged areas d). Isoproturon d). Irrigated areas Q.42. Which of the following gives effective Q.52. Flaming and steaming are successful control of Phalaris minor in wheat practical weed control tools in a). Hand weeding a). Asian countries b). Inter-cultivation b). Western countries c). Flaming c). African countries d). Clodinafop-proparygyl d). Japan Q.43. Integrated weed management practices Q.53. The practice that directly hit soil weed that seed bank in minimizing future weed in- a). Enhance crop competitive ability festation b). Decrease weeds ability to reduce yield a). Microwave irradiation c). Practices that eliminate weeds from an b). Soil solarization area c). Stale seed bed d). Both a and b d). All e). None e). Both a and c Q.54. A practice where one or two flushes of Q.44. The first phase of IWM as per Sheley weeds are destroyed before seeding a a). Integrated use of different methods crop b). Planning and implementation a). Cheeling c). Inventorization b). Stale seed bed d). Monitoring and evaluation c). Searing Q.45. Selective post-emergence herbicide d). None a). 2,4-D Q.55. A practice that does not necessarily in- b). Glyphosate volve tillage c). Paraquat a). Summer ploughing/hot weather culti- d). All vation Q.46. A non-selective contact herbicide b). Stale seed bed a). Glyphosate c). Soil solarization b). Paraquat d). None c). 2,4-D Q.56. Soil solarization increases soil tempera- d). None ture by Q.47. A soil applied herbicide a). 10-12 °C a). Glyphosate b). 3-4 °C 3 c). 15-16 °C d). Cell division inhibition d). 20-22 °C Q.66. Foundation for phenomenal achieve- Q.57. The condition intensifies the spread of ment in modern chemical weed manage- perennial propagules of weeds after be- ment ing exposed by tillage a). Safeners a). Hot weather b). Adjuvants b). Rainfall c). Selectivity c). High light intensity d). Herbicide combinations d). High wind e). None Q.58. Which is the ‘odd one’ based on mim- Q.67. Which of the formulations has low leach icry ability in soils a). Wild rice in rice a). EC b). Wild sorghum in sorghum b). WP c). Wild sugarcane in sugarcane c). Granules d). Itch grass in upland rice d). WSC Q.59. C4 weed Q.68. An enzymatic beta-oxidation process a). Avena fatua a). Conjugation b). Lolium temulentum b). Reverse metabolism c). Sorghum halepense c). Translocation d). Phalaris minor d). Metabolism Q.60. The environment friendly weed control Q.69. In case of combined application of her- method bicides, application rate can be reduced a). Biological in which of the following interaction b). Physical a). Antagonistic c). Chemical b). Synergistic d). None c). Additive Q.61. To devitalize weed seeds in manure, d). None the composting temperature must be in Q.70. Mixture of glyphosate with 2,4-D on which of the following range field bindweed had interaction of the type a). 35-50 °C a). Synergistic b). 50-65 °C b). Antagonistic c). 65-90 °C c). Additive d). Enhancement d). 90-105 °C Q71. The odd one amongst the following Q.62. Paraquat is associated with inhibition of a). Adjuvants which of the following b). Activators a). PSI c). Spray modifiers b). PSII d). Utility modifiers c). PPO Q.72. The odd one amongst the following d). HPPD a).Surfactants Q.63. Symptoms where shoots/leaves are b). Activators bleached white are caused due to c). Wetting agents a). Atrazine d). Phytobland oils b). Glufosinate Q.73. Physical removal/loss of herbicides c). Tembotrione a). Adsorption d). Fluazifop-p-butyl b).