Weed Science Part 1
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Question No. 1
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Who is known as the father of weed science?
A.
Thurston
B.
Mendel
C.
Jethrotull
D.
Cleverton
Question No. 2
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What percentage of crop losses in India is caused by weeds?
A.
25%
B.
50%
C.
10%
D.
40%
Question No. 3
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Which of the following weeds is responsible for causing dermal allergies in humans?
A.
Agropyron portulaca
B.
Sorghum helepens
C.
Parthenium hysterophorus
D.
Cuscuta
Question No. 4
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What is the term used for the harmful effect that one plant has on another through the production of chemical compounds?
A.
Allelopathy
B.
Dormancy
C.
Photosynthesis
D.
Symbiosis
Question No. 5
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What is the characteristic of weeds that exhibit forced seed dormancy due to seed placement at deep soil levels?
A.
Innate dormancy
B.
Induced dormancy
C.
Enforced dormancy
D.
Physiological dormancy
Question No. 6
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Which of the following types of weeds exhibits dormancy due to sudden environmental changes such as waterlogging?
A.
Induced dormancy
B.
Enforced dormancy
C.
Innate dormancy
D.
Genetic dormancy
Question No. 7
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Which of the following is a biennial weed example that completes its life cycle in two years?
A.
Canada thistle
B.
Cynodon dactylon
C.
Cyperus rotundus
D.
Lantana camara
Question No. 8
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Which type of weed completes its life cycle in more than two years and can be difficult to control?
A.
Perennial weeds
B.
Biennial weeds
C.
Annual weeds
D.
Noxious weeds
Question No. 9
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What type of weed is known to parasitize a variety of crops such as mustard, tobacco, and potato?
A.
Orobanche sp.
B.
Dodder
C.
Loranthus
D.
Striga sp.
Question No. 10
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What is the common name for the weed Cuscuta, which is known to be a total stem parasite?
A.
Dodder
B.
Chicory
C.
Sorghum
D.
Tobacco
Question No. 11
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Which of the following weeds is a facultative weed that grows both in wild and cultivated areas?
A.
Argemone Mexicana
B.
Chenopodium album
C.
Cynodon dactylon
D.
Echinochloa colonum
Question No. 12
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Which type of weed mimics the appearance of crops like wheat and survives well due to its morphological similarity?
A.
Wild oat (A. fatua)
B.
Chenopodium album
C.
Cynodon dactylon
D.
Echinochloa colonum
Question No. 13
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Which of the following is an example of an obligate weed, found only in cultivated lands?
A.
Chenopodium
B.
Cynodon dactylon
C.
Saccharum spontaneum
D.
Lantana camara
Question No. 14
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Which of the following weeds is known for being a noxious weed that is difficult to control and undesirable in agriculture?
A.
Lantana camara
B.
Striga sp.
C.
Cyperus rotundus
D.
Phalaris minor
Question No. 15
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Which type of weeds is particularly problematic for contaminating crop seeds due to their similar seed size and maturity time?
A.
Satellite weeds
B.
Obligate weeds
C.
Facultative weeds
D.
Crop-associated weeds
Question No. 16
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What practice involves pre-irrigating fields to allow weeds to germinate before planting crops?
A.
Weed suppression
B.
Stale seed bed
C.
Dormancy break
D.
Allelopathy
Question No. 17
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What type of dormancy is exhibited by wild oat (A. fatua) that is influenced by both its genetics and environmental conditions?
A.
Enforced, innate, and induced dormancy
B.
Innate dormancy
C.
Genetic dormancy
D.
Physiological dormancy
Question No. 18
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Which of the following is a perennial weed that spreads through rhizomes?
A.
Cuscuta
B.
Agropyron repens
C.
Lantana camara
D.
Chenopodium album
Question No. 19
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Which of the following weeds is known for being a host for insect pests such as stem borers and wilts?
A.
Chenopodium album
B.
Cynodon dactylon
C.
Lantana camara
D.
Phalaris minor
Question No. 20
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Which weed is specifically known to parasitize crops like maize and sugarcane?
A.
Cuscuta sp.
B.
Striga sp.
C.
Orobanche sp.
D.
Chenopodium album
Question No. 21
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What is the primary mechanism by which Argemone Mexicana disperses its seeds?
A.
Insect pollination
B.
Wind pollination
C.
Water dispersal
D.
Censer mechanism
Question No. 22
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What is the most effective way to control crop-bound weeds like Dodder (Cuscuta)?
A.
Manual pruning
B.
Hand weeding
C.
Paraquat spray
D.
Chemical herbicides
Question No. 23
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Which characteristic of wild rice (Oryza sativa var. fatua) allows it to survive well in paddy fields?
A.
Root parasitism
B.
Morphological similarity to the crop
C.
Chemical resistance to herbicides
D.
High seed yield
Question No. 24
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Which of the following is an example of a weed that serves as a host for various insect pests like caterpillars and borers?
A.
Chenopodium album
B.
Cynodon dactylon
C.
Lantana camara
D.
Phalaris minor
Question No. 25
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Which weed is known for being difficult to control due to its long life cycle and rhizome spread?
A.
Cyperus rotundus
B.
Lantana camara
C.
Cynodon dactylon
D.
Phalaris minor
Question No. 26
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What percentage of crop losses in India are attributed to weeds?
A.
15%
B.
25%
C.
35%
D.
45%
Question No. 27
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Which weeds are known to cause dermal allergies in humans?
A.
Parthenium hysterophorus and Helenium spp.
B.
Echinochloa colonum and Chenopodium album
C.
Cynodon dactylon and Cyperus rotundus
D.
Sorghum halepense and Argemone mexicana
Question No. 28
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What is allelopathy?
A.
The process of weed seed dispersal by wind.
B.
The beneficial interaction between different weed species.
C.
The harmful effect of one plant on another through chemical compounds.
D.
The competition between crops and weeds for resources.
Question No. 29
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What toxic substance is found in Johnson grass at its tillering stage?
A.
Prussic acid/HCN (Dhurin)
B.
Arsenic
C.
Strychnine
D.
Oxalic acid
Question No. 30
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What tragic event was associated with Mexican poppy seeds?
A.
Bhopal Gas Tragedy
B.
Delhi Dropsy Tragedy
C.
Chernobyl disaster
D.
Minamata disease
Question No. 31
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What is the seed dispersal mechanism of Argemone mexicana called?
A.
Animal dispersal
B.
Water dispersal
C.
Censer mechanism
D.
Explosive dispersal
Question No. 32
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Which of the following weeds propagates through rhizomes/runners/stolons?
A.
Bermuda grass
B.
Water hyacinth
C.
Purple nutsedge
D.
All of the above
Question No. 33
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Which weed acts as a host for the stem borer insect affecting rice?
A.
Echinochloa colonum
B.
Chenopodium album
C.
Agropyron repens
D.
Cenchrus ciliaris
Question No. 34
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Which weed is associated with ergot in pearl millet?
A.
Cenchrus ciliaris
B.
Leersia oryzoides
C.
Saccharum spontaneum
D.
Agropyron repens
Question No. 35
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What is weed dormancy?
A.
A stage of rapid growth.
B.
A stage of suspended development.
C.
A stage of seed production.
D.
A stage of flowering.
Question No. 36
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Which weed exhibits all three types of dormancy?
A.
Wild oat (Avena fatua)
B.
Chenopodium album
C.
Cyperus rotundus
D.
Parthenium hysterophorus
Question No. 37
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Which of the following is an example of a biennial weed?
A.
Chicory
B.
Cynodon dactylon
C.
Cyperus rotundus
D.
Sorghum halepense
Question No. 38
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Which of the following is a deep-rooted perennial weed?
A.
Cyperus rotundus
B.
Cynodon dactylon
C.
Agropyron repens
D.
All of the above
Question No. 39
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What are difficult perennial weeds also called?
A.
Annual weeds
B.
Biennial weeds
C.
Pernicious weeds
D.
Obligate weeds
Question No. 40
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Which type of weed grows in a specific season regardless of the crop?
A.
Season bound
B.
Crop bound
C.
Crop associated
D.
Obligate
Question No. 41
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Which of the following is a total stem parasite?
A.
Cuscuta (Dodder)
B.
Loranthus
C.
Orobanche
D.
Striga
Question No. 42
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Which crop is Lucerne commonly infested by Cuscuta?
A.
Wheat
B.
Rice
C.
Lucerne
D.
Maize
Question No. 43
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Which of the following is a partial stem parasite?
A.
Loranthus/Dendrophthoe falcate
B.
Cuscuta
C.
Orobanche
D.
Striga
Question No. 44
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Which of the following is a total root parasite?
A.
Orobanche
B.
Striga
C.
Cuscuta
D.
Loranthus
Question No. 45
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Which crops are commonly affected by Orobanche?
A.
Mustard, tobacco, chili, brinjal, potato
B.
Wheat, rice, maize
C.
Sugarcane, sunflower, sorghum
D.
All of the above
Question No. 46
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Which of the following is a partial/semi root parasite?
A.
Striga
B.
Orobanche
C.
Cuscuta
D.
Loranthus
Question No. 47
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Which crops are commonly affected by Striga?
A.
Sorghum, maize, sugarcane, sunflower
B.
Wheat, rice, barley
C.
Potato, tomato, brinjal
D.
All of the above
Question No. 48
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Which weeds are examples of mimicry weeds in wheat?
A.
Wild oat (Avena fatua) & Canary grass (Phalaris minor)
B.
Wild rice (Oryza sativa var. fatua)
C.
Chicory and Coronopus
D.
Allium sp. and wild garlic
Question No. 49
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Which weeds can contaminate crop seeds due to similar maturity time and height?
A.
Allium sp. (wild onion), wild garlic, and Phalaris minor
B.
Chenopodium album
C.
Cyperus rotundus
D.
Parthenium hysterophorus
Question No. 50
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Which of the following is an example of an obligate weed?
A.
Chenopodium
B.
Argemone mexicana
C.
Euphorbia hirta
D.
All of the above
Question No. 51
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Which of the following is an example of a facultative weed?
A.
Argemone mexicana and Euphorbia hirta
B.
Chenopodium
C.
Cyperus rotundus
D.
Parthenium hysterophorus
Question No. 52
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Which of the following is considered a noxious weed?
A.
Cyperus rotundus, Eichhornia crassipes, Saccharum moonja, Imperata cylindrica, Lantana camara, Cynodon dactylon, Parthenium hysterophorus
B.
Chenopodium album
C.
Avena fatua
D.
Phalaris minor
Question No. 53
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Which of the following is an example of a satellite/objectionable weed?
A.
Avena fatua, Phalaris minor, Chicory, Cuscuta
B.
Chenopodium album
C.
Cyperus rotundus
D.
Parthenium hysterophorus
Question No. 54
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What is a stale seed bed technique?
A.
Applying fertilizer before sowing.
B.
Irrigating before sowing to encourage weed germination and then destroying the weeds.
C.
Sowing the crop directly without any land preparation.
D.
Applying herbicides after crop emergence.
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