Plant pathology Questions and Answers
1. “Plant pathology” deals with the study of:-
A. Causal organism and management
B. Causal organism and disease cycle
C. Disease cycle and management
D. Causal organism, disease cycle and management of pant diseases
2. Factors responsible for disease occurrence :-
A. Host and pathogen
B. Susceptible host and pathogen
C. Susceptible host ,virulent pathogen and favorable environment
D. Susceptible host and virulent pathogen
3. The first book on plant pathology, entitled “Diseases of Cultivated Crops, their causes and their control” was written by :-
A. Kuhn
B. Tillet
C. De Bary
D. Micheli
4. The journal “Phytopathology” was begin to published in the year :-
A. 1891
B. 1895
C. 1911
D. 1918
5. In 1963 concept of vertical and horizontal resistance was given by :-
A. Eriksson
B. Orton
C. Stakman
D. Vanderplank
6. Gene for gene theory H.H. Flor worked with the rust of :-
A. Wheat
B. Barley
C. Linseed
D. Pea
7. Cedar-apple rust is caused by :-
A. Hemileia vastatrix
B. Melampsora lini
C. Uromyces appendiculatus
D. Gymnosporangium juniperi-virginianae
8. Mushrooms belongs to order :-
A. Agaricales
B. Exobasidiales
C. Uredinales
D. Ustilaginales
9. Generalized loss of turgidity and drooping of leaves or shoots are the symptoms of :-
A. Rust
B. Smut
C. Wilt
D. Mildew
10. Slima molds belongs to phylum :-
A. Myxomycota
B. Zygomycota
C. Oomycota
D. Ascomycota
11. Late blight of tomato is caused by :-
A. Phytophthora cactorum
B. Phytophthora cambivora
C. Phytophthora infestans
D. Phytophthora citrophthora
12. Special structures ” rhizoids” are produced in the fungus:-
A. Aspergillus
B. Penecillium
C. Mucor
D. Rhizopus
13. Downy mildew of grapes is caused by :-
A. Plasmopara halstedii
B. Plasmopara viticola
C. Peronospora destructor
D. Peronospora effusa
14. The fungi, causing powdery mildews, are:-
A. Obligali parasites
B. Facultative parasites
C. Obligate saprophytes
D. Facultative saprophytes
15. “Sigatoka disease” of banana is caused by :-
A. Mycosphaerella fragariae
B. Mycosphaerella musicola
C. Mycosphaerella citri
D. Magnaporthe grisea
16. Smut of bajara is :
A. Seed borne
B. Soil borne
C. Air borne
D. Seed and soil borne
17. “Whip smut” of sugarcane is caused by :-
A. Ustilego scitaminea
B. Ustilego nuda
C. Ustilego maydis
D. Ustilego hordei
18. Heterocious nature of stem rust of wheat was demonstrated by “-
A. Antom De Bary
B. Eriksson
C. Stakman
D. Craigie
19. Long smut of sorghum is caused by :-
A. Sphacelotheca cruenta
B. Sphacelotheca reiliana
C. Sphacelotheca sorghi
D. tolyposporium ehrenbergii
20. In black rust of wheat zero (0) stage of fungus is known as :-
A. Basidial
B. Uredial
C. Telial
D. Pycnidial
Practice Papers for Agriculture Students
21. Which one is poisonous mushroom ?
A. Pleurotus
B. Agaricus
C. Volvariella
D. Amnita
22. “Mycorrhiza” is the association of ;-
A. Fungi and Higher plants
B. Fungi and Algae
C. Fungi and Bacteria
D. Fungi and Insects
23. “Lichens” shows which type of association :-
A. Symbiosis
B. Commensalism
C. Synergism
D. Antibiosis
24. The smallest pathogenic agent is:-
A. Virus
B. Viroid
C. Virusoid
D. Prion
25. Filters used in Laminar air flow are known :–
A. HEPA -filters
B. Asbestos-filters
C. Porcelin-filters
D. Sintered glass filters
26. The “Quarantine laws” in USA were first enacted in :–
A. 1896
B. 1912
C. 1950
D. 1972
27. “Grassy shoot” disease of sugarcane is caused by :-
A. Fungi
B. Bacteria
C. Phytoplasma
D. Virus
28. L-form bacteria do not possess:-
A. Cell membrane
B. Cell wall
C. Mesosome
D. Ribosome
29. Which bacterium is a flagellate:-
A. Pseudomonas
B. Xanthomonas
C. Agrobacterium
D. Xylella
30. Typical “stem-pitting symptoms are produced in the disease:-
A. Citrus exocortis
B. Citrus tristeza
C. Citrus greening
D. Citrus canker
31. Alternate host of Bajra rust is :-
A. Tomato
B. Pea
C. Brinjal
D. Chilli
32. The conversion of whole thallus into reproductive structure, is called:-
A. Holocarpic
B. Eucarpic
C. Endocarpic
D. Mesocarpic
33. Counter stain for gram positive bacteria as:-
A. Crystal violet
B. Iodine
C. Saffranin
D. cottan blue
34. Minimum magnification power of “Electron microscope” is :-
A. 100 times
B. 1000 times
C. 10000 times
D. 100000 times
35. The enlargement of host tissues due to excess cell division is called :-
A. Hyperplasia
B. Hypertrophy
C. Hypoplasia
D. Hypotrophy
36. Dispersal of plant pathogens through wind is known :-
A. Hydrochory
B. Zoochory
C. Anemochory
D. Anthorochory
37. Browning of vascular bundles occurs in the disease :-
A. Wilt
B. Smut
C. Rust
D. Bunt
38. Sterilization of culture medium in done at a pressure of :-
A. 10 psi
B. 15 psi
C. 20 psi
D. 25 psi
39. Van Everdingen (1933) evolved “Dutch rules” for the fungus :-
A. Puccinia striiformis
B. Albygo candida
C. Phytophthora infestans
D. Pythium debaryanum
40. “Indian type culture collection” for fungi is located at :-
A. Kolkata
B. Hyderabad
C. New Delhi
D. Mumbai
41. ” Striga” is a plant parasite:-
A. Total stem parasite
B. Total root parasite
C. Partial stem parasite
D. Partial root parasite
42. “Pyricularin” is produced by the fungus :-
A. Pyricularia oryzae
B. Fusarium oxysporum
C. Helminthosporium maydis
D. Helminthosporium victorae
43. Fastidious vascular bacteria are mainly restricted to the region :-
A. Epidermis
B. Vascular bundles
C. Cortex
D. Pith region
44. First plant pathogenic nematode was discovered by :-
A. Needham
B. Cobb
C. Kuhn
D. Devaine
45. Bengal famine is related with the crop:-
A. Wheat
B. Paddy
C. Potato
D. Maize
46. Pycnia with acervuli production is the feature of class:-
A. Hyphomycetes
B. Coelomycetes
C. Blastomycetes
D. Pyrenomycetes
47. The ratio of copper sulphate and ammonium sulphate in “Cheshunt” compound is:-
A. 2:11
B. 3:11
C. 5:11
D. 10:11
48. Coenocytic mycelium is present in fungus :-
A. Phytophthora
B. Ustilago
C. Puccinia
D. Alternaria
49. Naked asci are produced in the class :–
A. Discomycetes
B. Pyrenomycetes
C. Plectomycetes
D. Hemiascomycetes
50. First produced systemic fungicide is :-
A. Bordeaux mixture
B. Captan
C. Thiram
D. Carboxin
51. Parasexuality phenomenon was first observed in the fungus :-
A. Aspergillus nidulans
B. Aspergillus flavus
C. Aspergillus niger
D. Penicillium notatum
52. The perfect stage of Helminthosporium is :-
A. Thanatephorus
B. Mangnaporthe
C. Cochliobolus
D. Talaromyces
53. Leaf smut of rice is caused by :-
A. Entyloma oryzae
B. Urocystis tririci
C. Ustilego tririci
D. Ustilego nuda
54. The total stem parasite is :-
A. Loranthus
B. Orobanche
C. Striga
D. Cuscuta
55. The cause of “black heart” disease of potato is :-
A. Water stress
B. Frost injury
C. High light intensity
D. Lack of oxygen
56. The disease which takes more than one year to complete the disease cycle is known as :-
A. Polyetic
B. Monocyclic
C. Polycyclic
D. Demicyclic
57. Tundu disease of wheat is caused by Clavibacter with nematode:–
A. Anguina tritici
B. Meloidogyne graminicola
C. Heterodera avenae
D. Ditylenchus angustus
58. Viruses are mainly transmitted by :-
A. Insects
B. Fungi
C. Bacteria
D. Nematodes
59. The term “Boom & Burst cycle” for disease resistance was given by :-
A. Flor
B. Priestley
C. Prusiner
D. Voinnet
60. First resistance (R) gene cloned and sequenced in 1992 from maize is :–
A. Hm – 1
B. Cf – 9
C. Pt – 0
D. Xa – 21
61. Mycorohiza supplies which nutrient in the plants :-
A. Iron
B. Sulphur
C. Phosphorus
D. Nitrogen
62. Pasteurization is done at temperature:-
A. 62.8 °C
B. 80.0 °C
C. 90.7 °C
D. 100.0 °C
63. The perfect stage of Aspergillus is :-
A. Erotium
B. Thanetophorus
C. Glomerella
D. Gibberella
64. “Khaira disease ” of rice is caused by deficiency of :-
A. Nitrogen
B. Zinc
C. Potash
D. Phosphorus
65. The organisms lacking a well defined nucleus are known as:-
A. Fungi
B. Protozoa
C. Eukaryotes
D. Prokaryotes
66. Conidia and sporangia are produced by :-
A. Viruses
B. Fungi
C. Bacteria
D. Phytoplasma
67. Solar heat treatment for the control of loose smut of wheat was given by :-
A. Jensen
B. Mitra
C. Butler
D. Luthra and Sattar
68. Which toxin is host specific:–
A. Tabtoxin
B. Tentoxin
C. Victorin
D. Phaseotoxin
69. Peach leaf curl disease is caused by :-
A. Virus
B. Bacterium
C. Fungus
D. Phytoplasma
70. “Kresek phase” symptoms found in :-
A. Latiblight of patato
B. Black arm of cotton
C. Bacterial leaf blight of rice
D. Moko disease of banana
71. Club root disease of cabbage was first reported by :-
A. N.A.Cobb
B. E.J.Butler
C. Woronin
D. K.C.Mehta
72. Tungo disease of rice is caused by :-
A. Bacteria
B. Fungi
C. Virus
D. Phytoplasma
73. Eriophyde mite is transmitting :-
A. Little leaf of brinjal
B. Bunchy top of banana
C. Sterility mosaic of pigeon pea
D. citrus greening
74. Phytoplasma contains :-
A. Only RNA
B. Only DNA
C. Both RNA and DNA
D. Only protein coat
75. Red leaf of cotton is a deficiency disease due to :-
A. Copper
B. Iron
C. Boron
D. Nitrogen
76. Ooze test is the diagnostic test for :-
A. Bacteria
B. Virus
C. Nematode
D. Fungi
77. Match the correct of the following Imperfect Stage Perfect Stage
A. Aspergillus —– a. Mycosphaerella
B. Cercospora—- b. Cochliobolus
C. Cercospora—– c. Glomerella
D. Bipolaris———d. Eurotium
A. A-(a), B-(b), C-(c), D-(d)
B. A-(d), B-(a), C-(b), D-(c)
C. A-(d), B-(c), C-(b), D-(a)
D. A-(d), B-(c), C-(a), D-(b)
78. The two important compounds of cell wall in most of the fungi are :-
A. Glucan and cellulose
B. Peptidoglycan and cellulose
C. Chitin and cellulose
D. Peptidoglycan and Chitin
79. Some pathogens secrete an iron chelating agent known as :-
A. P.R.Proteins
B. Siderophores
C. Phytoalexins
D. Elicitors
80. Which Fungicide is specific for downy mildew fungi :-
A. Chlorothalonil
B. Plantvax
C. Metalaxyl
D. Vitavax
81. An example of compound interest disease is :-
A. Wilt of gram
B. Root rot of cotton
C. Stem rust of wheat
D. Club root of cabbage
82. Local and systemic both infection are found in :-
A. Covered smut of barley
B. Karnal bunt of wheat
C. White rust of Mustard
D. Black rust of wheat
83. Virus is transmitted by which nematode?
A. Globodera
B. Meloidogyne
C. Heterodera
D. Xiphinema
84. Which of the following fungi is called weed of the laboratory?
A. Fusarium solani
B. Cercospora personata
C. Pyricularia oryzae
D. Aspergillus niger
85. Characteristic H-shaped structure of primary sporidia is found in :-
A. Neovossia
B. Ustilago
C. Sphaerotheca
D. Tilletia
86. White one is commonly known as grey mold fungus?
A. Penicillium italicum
B. Penicillium notatum
C. Botrytis cinerea
D. Aspergillus niger
87. Gossypium arboreum species of cotton are found resistant against disease :-
A. Root rot
B. Wilt
C. Bacterial leaf blight
D. Leaf curl
88. In which of the following fungi zoospores are formed inside vesicle?
A. Phytophthora
B. Phythium
C. Rhizoctonia
D. Albugo
89. Taphrina maculans causes the disease :-
A. Leaf spot of turmeric
B. Tikka of groundnut
C. Powdery mildew of pea
D. Wilt of pigeon pea
90. Perithecia with single ascus and simple appendages are found in the genus :-
A. Erysiphe
B. Uncinula
C. Sphaerotheca
D. Podosphera
91. Coffee rust was first reported in 1868 from:-
A. Brazil
B. Ceylon
C. India
D. Indonesia
92. Which is of the following fungi is commonly known as white mold/stem rotting:-
A. Rhizoctonia solani
B. Sclerotinia sclerotiorum
C. Fusarium solani
D. Albugo candia
93. Red onion is resistant to smudge due to presence of :-
A. Phenolic contents
B. Catechol and protocatechuic acid
C. Cholorogenic acid
D. Wax
94. Anthracnose of grapes is caused by :-
A. Elsinoe ampelina
B. Greenaria viticola
C. Plasmopara viticola
D. Uncinula necator
95. The symbiont bacterial genus is :-
A. Xanthomonas
B. Clavibacter
C. Bacillus
D. Rhixzobium
96. On culture media, mycoplasmal colonies appear as :-
A. Rod shaped
B. Helical
C. Spiral
D. Fried-egg appearance
97. Tomato leaf curl virus is transmitted by:-
A. Myzus persici
B. Bemisia tabaci
C. Thrips tabaci
D. Infected plant material
98. Match the correct of the following
A. Potassium dichromate —-(a). Fixative
B. Agar-agar —-(b). Cleaning solution
C. Lectophenol—-(c). Mounting medium
D. Formalin acetic acid——-(d).Solidifying agent
A. A-(a), B-(b), C-(c), D-(d)
B. A-(d), B-(b), C-(a), D-(c)
C. A-(a), B-(c), C-(d), D-(b)
D. A-(b), B-(d), C-(c), D-(a)
99. Stem galls of coriander is caused by :-
A. Fusarium
B. Alternaria
C. Protonaria
D. Cercospora
100. Which among the following is commonly known as oyster mushroom?
A. Volvariela
B. Agaricus
C. Pleurotus
D. Lentinus
