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

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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