This document contains 100 multiple choice questions related to weed management. It begins with an introduction stating that the questions are part of an assignment on weed management for a course at Indira Gandhi Krishi Vishwavidyalaya in Raipur, Chhattisgarh, India. The questions cover topics like weed classification, examples of different types of weeds, weed control methods, herbicides and their properties/modes of action.

1. COLLEGE OF AGRICULTURE & RESEARCH STATION
KAPA, MAHASAMUND (C.G.)
SESSION 2020-21
An Assignment On
100 MCQ related questions to weed management.
COURSE TITLE :- Weed Management
COURSE NO. :- AGRO-02(5211)
CREDIT HOURS :- 3(2+1)
INDIRA GANDHI KRISHI VISHWAVIDYALAYA, RAIPUR (C.G.)
Submitted To :
Dr. G.S Tomar
Department of Agronomy
Submitted By :
Name : Ritesh Agrawal
Year/Semester : 2nd
Year/1st
Sem.

2. 100 MCQ ON CROP PRODUCTION TECHNOLOGY – WEED
MANAGEMENT
1.Heavy infestation of which of the following causes poor ploughing performance
(A) E. Colonum
(B) Cyprus rotundus
(C) Cynodon dactylon
(D) None of these
Ans :C
2. Based on morphology, the weed is classified into
(A) Grass
(B) Sedge
(C) Broad leaved weeds
(D) All of these
Ans :D
3. Examples of broad leaved weed is
(A) Flavaria australacica
(B) Digeria arvensis
(C) Abutilon indicum
(D) All of these
Ans :D
4. Which of the following is not a indigenous weed?
(A) A. indica
(B) A. indicum
(C) P. hysterophorus
(D) None of these
Ans :C

3. 5. Total root parasite on tobacco is
(A) Parthenium
(B) O. Cermua
(C) D. Stramonium
(D) W. Somnifera
Ans :B
6.Eichhornia crassipes is
(A) Submerged weed
(B) Marginal weed
(C) Floating weed
(D) All of these
Ans :C
7.Zygogramma bicolorata beetle feed on leaves of
(A) Water hyacinth
(B) Parthenium
(C) Lantana
(D) All of these
Ans :B
8. Phytophthora palmivora causes root rot in
(A) Morrenia Odorata
(B) A. Virginica
(C) S. Halepense
(D) All of these

4. Ans :A
9.Application of volatile chemical on confined spaces to produce gas that will
destroy weed seeds is called
(A) Fumigation
(B) Herbigation
(C) Band application
(D) All of these
Ans :A
10.A herbicide which kills some species in a mixed growth plant species are t
ermed as
(A) Selective herbicides
(B) Nonselective
(C) Contact
(D) None of these
Ans :A
11.Commelina benghalensisbearing short- lived blue coloured flowers is a
(A)Monocot
(B)Dicot
(C)Spermatophyte
(D)Pteridophyta
Ans:A
12.A weed having spines as adaptations that repelgrazing
(A)Solanumnigrum
(B)Solanumxanthocarpus
(C)Parthenium

5. (D)Ageratum
Ans;B
13.Which of the following causes itching and inflammation
(A)Ammanniabaccifera
(B)Solanumnigrum
(C)Urticasp
(D)Lantanacamara
Ans:C
14.Cultivation of water chestnut (Trapabispinosa) is abandoned in India due
to
(A) Lantanacamara
(B)Eichhornia
(C)Mikaniamicrantha
(D)Acaciamearnssi
Ans:B
15.The partial root parasite
(A)Cuscuta
(B)Loranthus
(C)Striga
(D)Orobanche
Ans:C
16.A weed with a funnel shaped corolla
(A) Medicagodenticulata
(B)Viciasativa
(C)Convolvulusarvensis
(D)Scirpussp

6. Ans:C
17.A sedge with rhizomes
(A) Commelinaobliqua
(B) Cyperusrotundus
(C) Scirpussp
(D) Eleocharis
Ans:B
18.A lowland rice sedge
(A) Cyperusiria
(B)Cyperusdifformis
(C) Cyperusesculentus
(D) All
Ans:D
19.The natural product explored as com- mercialherbicide
(A) glufosinate
(B) dicamba
(C) cinmethylin
(D)all
Ans:D
20.Dryland weeds usually have
(A) deeproot
(B)hairyness
(C)Mucilaginous stem
(D)All
Ans:D
21.A system approach based on whole land useplanning
(A)Weed eradication
(B)Weed control

7. (C)Weed prevention
(D)None
Ans:D
22.Azollapinnatais is an:
(A) a fern
(B)analgae
(C)a gymnosperm
(D) anangiosperm
Ans:A
23.Besides providing N Azolla is used for weed controlin
(A) Wheat
(B)Rice
(C) Castor
(D)Linseed
Ans:B
24.Dredging is most effective treatment for controlling
(A) Parasitic weeds
(B) Lantana
(C)Agrestals
(D)Aquaticweeds
Ans:B
25.Flooding is an effective strategy to con- trol
(A) Avenaludoviciana
(B) Sorghum halepense
(C)Cynodondactylon
(D) All
Ans:A
26.Bioagent for controlling Parthenium hysterophorus
(A)Bactraverutana
(B)Zygogrammabicolorata

8. (C)Chrysolira
(D)Fleabeetle
Ans:B
27.A companion crop
(A) Hairyvetch
(B) Winter rye
(C) Cowpea
(D) All
Ans:D
28.Post-plant tillage helps in
(A) Mixing ofmanures
(B)Control ofweeds
(C)Soil and water conservation
(D) All
Ans:D
29.Inter-culture with bullocks in standing water
(A)Rice
(B)Sorghum
(C)Pearlmillet
(D) all
Ans:A
30.The first chemical shown to have herbi- cidalactivity
(A) 2,4-D
(B)Bordeuxmixture
(C)Paraquat
(D) 2,4-DB
Ans:B
31.Integrated weed management practices that
(A)Enhance crop competitiveability

9. (B)Decrease weeds ability to reduce yield
(C) Practices that eliminate weeds froman
area
(D)Both a andb
Ans:D
32.Selective post-emergence herbicide
(A)2,4-D
(B) Glyphosate
(C) Paraquat
(D) All
Ans:A
33.A non-selective contact herbicide
(A)Glyphosate
(B)Paraquat
(C) 2,4-D
(D)None
Ans:B
34.Application of bio-herbicides
(A) Aerialsprays
(B) Cut and paste
(C) Soil application
(D) All
Ans:D
35.Which is the ‘odd one’ based on mim- icry
(A)Wild rice inrice
(B)Wild sorghum insorghum
(C)Wild sugarcane in sugarcane
(D) Itch grass in uplandrice
Ans:D
36.C4weed
(A)Avenafatua
(B)Loliumtemulentum

10. (C) Sorghum halepense
(D) Phalarisminor
Ans:C
37.Foundation for phenomenal achieve- ment in modern chemical weed
manage- ment
(A) Safeners
(B)Adjuvants
(C)Selectivity
(D) Herbicide combinations
Ans:C
38.Physical removal/loss of herbicides
(A)Adsorption
(B) Hydrolysis
(C)Deamination
(D) Dealkylation
Ans:A
39.Striga densifloraand Orobancheaegyp- ticaare the weedsof
(A)Rice andWheat
(B)Sugarcane andMustard
(C)Wheat and Sugarcane
(D) Oats and Rice
Ans:B
40.Competitive crops such as corn or soy- bean require weed-free period of
(A)2months
(B)3-4weeks
(C)3months
(D)None of the above
Ans:B
41.Test weight of Phalaris minor is
(A)10g

11. (B)15 g
(C)7g
(D)2g
Ans:D
42.One to two flushes of weeds are de- stroyed before planting of crop is
called
(A)Stale seedbed
(B)Blind hoeing
(C) Weeding
(D)Summer ploughing
Ans:A
43.Struggle for survival and existenceis called
(A)Critical period
(B) Competition
(C) Dormancy
(D)Persistence
Ans:B
44.The period at which maximum crop weed competition occursis
(A)Criticalperiod
(B)Dormancy
(C)Flaming
(D)Threshold
Ans:A
45.Critical period of crop weed competi- tionin sugarcaneis
(A)30-40days
(B)30-120days
(C)10-40days
(D)15-30days
Ans:B
46.Which herbicide is systemic and trans- located type?
(A)Atrazine

12. (B)Diuron
(C)Paraquat
(D)Glyphosate
Ans:D
47.Which herbicide is amino acid synthe- sisinhibitor
(A)Glyphosate
(B) 2,4-D
(C) MCPA
(D)None
Ans:A
48.Which herbicide not belong to triazine group
(A)Atrazine
(B)Metribuzin
(C)Bentazon
(D)Ametryn
Ans:C
49.The mode of action of Isoproturonis
(A) Rootinhibitor
(B)Shootinhibitor
(C)Photosynthesisinhibition
(D)Amino acid inhibition
Ans:C
50.The type of soils which require higher dose of herbicides to be effective is
(A)Inceptisols
(B) Histosols
(C)Oxisols
(D)Ultisols
Ans:B
51.The ideal temperature for application of post-emergent herbicides is in the
rangeof
(A)150C to 200C
(B)150C to 250C
(C)180C to 300C
(D) 250C to 350C
Ans:C
52.Volatilisation losses are more in which of the followingcondition
(A)Cold

13. (B) Warm
(C)Humid
(D)Dry
Ans:B
53.Herbicide leaching is prominent in
(A)Sandy
(B)Sandy loam
(C) Clay loam
(D) loam
Ans:A
54.The major means for herbicide dissi- pation is which type of following
degra- dation
(A)Microbial
(B)Chemical
(C)photo
(D) Physical
Ans:A
55.Humicants acts as an agent to prevent
(A) Washingoff
(B)Spreading
(C) Drying
(D) Incompatibility
Ans:C
56.A systemic pesticide ?
(A) kills anything it touches
(B) rootabsorbed
(C)Root/shoot absorbed &transloca- tive
(D)Shootabsorbed
Ans:C
57.A herbicide is used to kill what type of pest?
(A)Plants
(B) insects

14. (C) diseases
(D) bacteria
Ans:A
58.Glyphosate is the active ingredient of:
(A)Gramoxone
(B)Treflan
(C)Himore
(D) Round-up
Ans:D
59.The potential of a pesticide for causing damage to plants isits:
(A)phytotoxicity
(B)lethaldose
(C)defoliation ability
(D)chronicity
Ans:A
60.There is a greater risk of damage of herbicide in protected environments
due to
(A)absorption
(B) leaching
(C) runoff
(D) volatilization
Ans:D
61.Triazine resistant canola is example of
(A)Transgenic
(B)Nontransgenic
(C)Both
(D)None of theabove
Ans:B
62.Bromoxynil (Bxn) is resistant trait of whichcrop

15. (A)Soybean
(B)Sugarbeet
(C)Maize
(D)Cotton
Ans:D
63.Glufosinate (Bar) is resistant trait of whichcrop
(A)Soybean
(B)Sugarbeet
(C)Maize
(D)Cotton
Ans:D
64.Epinasty of cotton is used to measure qualitative assayof
(A)Atrazine
(B)2,4-D
(C) Diuron
(D)Alachlor
Ans:B
65.Present in sweet clover, an anti-blood co- agulant in animals isnamed as
(A)Dicumarin
(B)Swainsonne
(C) Lantradene A
(D)None of these
Ans:A
66.Weed responsible for dermal allergies on humanis
(A)Carrotgrass
(B)Common rag weed
(C)Sneezeweed

16. (D) All of these
Ans:D
67.Which of the weed act as alternate host on gram caterpillar ofredgram?
(A) Amaranthus
(B) Datura
(C)Both a andb
(D)None ofthese
Ans:C
68.Weed which reduces the Juice quality of sugarcane is
(A)Aeginitiaindica
(B)Striga litura
(C)Both a andb
(D)None ofthese
Ans:C
69.A diociousweed
(A) Canada thistle
(B)Eelgrass
(C) Amaranthus sp
(D) Both a and b
Ans:D
70.A weed producing > 1 lakh seeds/plant
(A) Amaranthus sp
(B)Portulacasp
(C) Both a and b
(D) Cascuttasp
Ans:C

17. 71.The weed producing smallest seed
(A)Cuscutasp
(B) Xanthium sp
(C) Amaranthus sp
(D)Commelinasp
Ans:A
72.A weed brought as ornamental
(A)Water hyacinth
(B)Lantana
(C)Both a andb
(D)None ofthese
Ans:C
73.A dominant weed of puddle paddy soil
(A)Echinochloa
(B) Caesulina
(C) Ecliptasp
(D)All ofthese
Ans:D
74.In which of the weed the underground sys- tem is located deeper than
onemetre?
(A)Cyperusrotundus
(B) Sorghum halepense
(C) Pluchealanceolata
(D) All of these
Ans:D
75.Mimicry weed in wheatfield

18. (A) Phalaris minor (Canary grass)
(B) Wild oat
(C)Both a andb
(D)None ofthese
Ans:C
76.Industrial weeds can be controlled by using
(A) Non selectiveherbicides
(B)Selective herbicides
(C) Soilsterilants
(D) Both a andc
Ans:D
77.Most dominant factor influencing weed composition in a fieldis
(A)Soilmoisture
(B)Soil type
(C)Soiltexture
(D)Soil temperature
Ans:A
78.Test weight (g) of Phalaris minor is
(A)2
(B)10
(C)15
(D)20
Ans:A
79.Dormancy mechanism in wild oats
(A)Innate
(b) Induced

19. (C)Enforced
(D) All of these
Ans:D
80.Submerged weed
(A)Hydrilla verticillata
(B)Nagarsp
(C)Utriculariastellaris
(D)All of these
Ans:D
81.Acidophileweed
(A) Digitariasanguinalis
(B)Borreriasp
(C)Both a andb
(D)None ofthese
Ans:C
82.A basophileweed
(A) Alkali grass (Puccinalliasp)
(B)Quack grass
(C) Amaranth sp
(D)Both a and b
Ans:D
83.Kharif annual weed
(A) Ammanniabacifera
(B) Cyperusdifformis
(C)Ludwigiaparviflora
(D) All ofthese

20. Ans:D
84.A simple perennial weed
(A)Ipomoeacarnea
(B) Lantana camara
(C) Both a and b
(D)None ofthese
Ans:C
85.Weed eradication is rare but practiced in
(A)Lantana
(B)Saccharum sp
(C)Striga sp
(D)All of these
Ans:D
86.Early post-emergence treatment is followed in
(A)Potato
(B)Sugarcane
(C) Both a and b
(D)Rice
Ans:C
87.Which is foliage acting herbicide?
(A)Glyphosate
(B)Paraquat
(C) EPTC
(D) Both a and b
Ans:D

21. 88.Early post-emergence treatment is followed in
(A)Potato
(B)Sugarcane
(C)Both a and b
(D)Rice
Ans:C
89.Which is the contact, non-selective and zero persistent herbicide insoils?
(A)Paraquat
(B) Atrazine
(C) 2,4-D
(D)Bromacil
Ans:A
90.Alachlor is an effective pre-emergence her- bicidein
(A)Maize
(B)Soybean
(C)Both
(D)None
Ans:C
91.Butachlor has to be applied to control weeds in upland riceat
(A) Immediately after sowing
(B) 2 DAS
(C)6-8DAS
(D)15DAS
Ans:D
92.Isoproturon to wheat is effective at
(A)15DAS
(B)25-30 DAS

22. (C)45-DAS
(D)5 DAS
Ans:B
93.Application of which herbicide at 5-10% of emergence in potato is more
common in India?
(A) Paraquat
(B) Diquat
(C)EPTC
(D) Both a and b
Ans:D
94.A noxious weed of South India
(A)Cynodon
(B)Cyperus
(C)Wildbrinjal
(D)All
Ans:C
95.Native of water hyacinth is
(A)Australia
(B)Brazil
(C) India
(D)China
Ans:B
96.The effective solution to manage weed shifts
(A)Herbicide combinations
(B) Herbicide rotations
(C) Crop rotations

23. (D)All
Ans:D
97.The selectivity is an ex- ample of trueselectivity
(A)Chronological
(B)Biochemical
(C)Chemical
(D) None
Ans:B
98.A potassium lover
(A) Chenopodium
(B)Digitaria
(C)Amaranthus
(D)Setaria
Ans:A
99.Having higher phosphorus content
(A)Amaranthus
(B)Setaria
(C)Chenopodium
(D)Digitaria
Ans:D
100.Competitive ability of the crops in decreas- ing order
(A)barley>rye>wheat >oats
(B) oats>wheat> rye> barley
(C)rye>barley>oats>wheat
(D)wheat>oats>barley >rye
Ans:A