Agri-MCQs #12: Weeds Management

1. The word competition comes from ______ word “competere”





2. Weed-crop competition is severe ________

*a.At early growth stagesbThroughout the growth period

   c.At lateral growth stagesd.None of these



3. Mixing of two or more crops of different species result in 

a.No competition for weeds*bIncreased competition for weeds

c.Decreased competition for weedsd.None of these



4. ___________ can be driven away if gram is included in rotation.

a.Phalaris minor*bAvena fatua

c.Chenopodium albumd.Chenopodium murale



5. _________weather conditions  favour weed growth

a.Favourable *bAdverse

c.Normald.None of these



6. __________ is the first nutrient to become limiting in weed-crop competition





7. The shortest time span in life cycle of a crop when weeding results in highest economical returns is called

a.Economic threshold levelbCritical threshold level

c.Economic weed-crop competition period*d.Critical weed-crop competition period



8. In ______ poisonous compound prussic acid contents increases at tillering stage

*a.Sorghum halpenseb.Echinocloa crusgali

c.Avena fatuad.Phalaris minor



9. If seeds of __________ mixed with mustard oil it can cause death and blindness in human being

a.Cenchrus ciliaris*bArgemone mexicana

c.Lolium temolentumd.Avena fatua



10. _________ is alternate host of stalk borer of miaze

*a.Chenopodium albumb.Chenopodium murale

c.Echinocloa crusgalid.Cyprus rotundus



11. Which weed is used as pollution indicator?

a.Fathen  BWild mustard

c.Wild spinach*d.Both a & b



12. Chick weed indicates _________

a.Acidic soilBBasic soil

c.Calcareous soil*d.Neutral soil



13. Faten hen is English name of _______

a.Chenopodium album*b.Chenopodium murale

c.Echinocloa crusgalid.Cyprus rotundus



14. Weed ecology is divided into ___________

a.Weed autecology & cytology*bWeed autecology & synecology

c.Weed autecology & anatomyd.None of these



15. In weed autecology we study 

a.Interspecific competitionb.Intraspecific competition

*c.Both a & bd.None of these



16. The community character is dynamic and change in course of time due to external and internal factors and is called _____ 

a.Ecological optima*bEcological succession

c.Ecological alterationd.None of these



17. Which one is a category of weed depending upon light requirement?


c.Photophytes*d.Both a & b



18. Weeds with triangular stem are called ________

a.Herbs *bSedges

c.Shrubs  d.Creepers



19. Cressa cretica is a common weed found in _______ soils of Sindh


c.Acidicd.Both a & b



20. Typha species grow in ________ soils


c.Acidicd.Both a & b



21. Basophiles are weeds which grow well in _____ soils


c.Neutrald.Both a & b


22. __________ grow in acidic soils


c.Neutrophilesd.None of these



23. __________ is associated weed of rice and grow well in frequent flooding 

a.Avena fatua* bEchinocloa crusgali

c.Phalaris minord.Echinocloa arvensis



24. Striga Spp. Is a parasitic weed of __________


* c.Sugarcaned.cotton



25. Asphadelus tenuifolius is associated weed of 

* a.Gram  bWheat

c.Lentil  d.Soybean



26. Which one is not an associated weed of wheat

a.Wild oatbDumbi sitti

c.Krund* d.Itsit



27. Which one  is major weed of wheat

a.Wild onionbWild pea

*c.Wild oatd.Itsit



28. The botanical name of wild oat is 

*a.Avena fatuabAvena sativa

c.Phalaris minord.Chenopodium album



29. Cyperus rotundus is locally called __________


c.Diddend.Jangli Jai



30. Wild oat is differentiated from wheat due to ___________

*a.Presence of well developed ligulesbPresence of well developed auricles

c.Absence of both ligules and auricled.Presence of both ligules and auricles 



31. The process of limiting weed infestation so that crops can be grown profitably is called __________________

*a.Weed controlbWeed management

c.Weed eradicationd.Integrated weed management 



32. The principle of weed management is _____________

a.To eradicate weeds*b.To reduce weed density to Economic Threshold Level

c.To shift competition in favour of weeds  d.To make conditions suitable for weed control



33. The seeds of Chenopodium album can remain viable for _______ years after burial in the soil





34. Phalaris minor  can produce ________ seeds per plant





35. The seeds of Chichorium intybus  are morphologically similar to 




36. The roots of lehli can go upto the depth of _________ feet





37. The plants of Echinocloa resembles with seedlings of ________





38. Use of same herbicide year after year results in _______

a.Complete eradication of a specific weed*bResistance in weed for that herbicide

c.No effect on weedsd.Damage crop plants



39. Which one is not a preventive method of weed control?

a.Use of weed free seed  bUse of well rotten farm yard manure

*c.Adjustment in time of sowing  d.Use of clean tools and machinery


40. Days to emergence decrease with __________ seeding depth


c.Constantd.None of these



41. At the time of transplanting rice seedling, field should be kept flooded with _____ cm





42. __________ is used as biological agent for controlling weeds

a.Crab fish*bCray fish

c.Star fishd.None of these



43. Direct or indirect harmful effect of one plant on another through production of chemical compound is called ________





44. Which one is not an allelopathic agent?





45. Which one is not a type of mulch?

a.Living mulchb.Organic mulch

c.Natural mulch*d.Thermal mulch



46. __________ is also known as field bind weed.

*a.Convolvulus arvensis  bTriticum aestivum

c.Trianthema portulacastrum  d.Cyprus rotundus



47. Wild onion propagates asexually by ________





48. Which one is not an annual weed?

a.Chenopodium albumbBidens pilosa

*c.Daucus carotad.Both a & b



49. Convolvulus arvensis  is also called ____

*a.Lehlib.Billi booti

c.It sitd.Bathu



50 Which one is not a weed of cotton?

a.It sitb.Deela

*c.Wild oatd.Chulai



51. Which one is not a post-emergence herbicide?


c.Puma super*d.Stomp



52. Weed density-crop relationship is ______


c.Curvilineard.None of these



53. Which crop has allelopathic potential?

a.Sorghum  b.Rice

c.Oat*d.Both a & b



54. Which one is perennial weed?

a.Chenopodium albumb.Avena fatua

*c.Cyprus rotundusd.None of these

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