Agri-MCQs #12: Weeds Management

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

*a.Latinb.Greek

c.Frenchd.English

 

 

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

a.Phosphorus*b.Nitrogen

c.Potashd.Zinc

 

 

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?

a.SciophytesbHeliophytes

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

a.Waterlogged*bSalt-affected

c.Acidicd.Both a & b

 

 

20. Typha species grow in ________ soils

*a.WaterloggedbSalt-affected

c.Acidicd.Both a & b

 

 

21. Basophiles are weeds which grow well in _____ soils

*a.AlkalibAcidic

c.Neutrald.Both a & b

 

22. __________ grow in acidic soils

a.Basophiles*b.Acedophiles

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 __________

a.RicebWheat

* 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 __________

a.Itsit*b.Deela

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

a.5-10b10-15

c.15-20*d.20-25

 

 

34. Phalaris minor  can produce ________ seeds per plant

a.1000-3000*b3000-5000

c.5000-7000d.7000-9000

 

 

35. The seeds of Chichorium intybus  are morphologically similar to 

a.Lucern*bBerseem

c.Shaftald.Jantar

 

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

a.5b.10

c.15*d.20

 

 

37. The plants of Echinocloa resembles with seedlings of ________

a.Wheat*bRice

c.Maized.sorghum

 

 

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

a.Decreased*bIncreased

c.Constantd.None of these

 

 

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

a.2-4b4-6

c.3-5*d.5-7

 

 

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 ________

a.Chemopathy*b.Allelopathy

c.Homeopathyd.Allopathy

 

 

44. Which one is not an allelopathic agent?

a.FlavonoidbQuinone

c.Terpenoid*d.Lactose

 

 

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 ________

a.Stolon*bBulbs

c.Tubersd.Corms

 

 

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?

a.Affinityb.Atrazine

c.Puma super*d.Stomp

 

 

52. Weed density-crop relationship is ______

a.Linearb.Sigmoidal

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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