Plant Pathology MCQs: List of Questions on Plant Pathology for Students

Article shared by :

Plant Pathology MCQs: List of Questions on Plant Pathology for Students (With Answers)!

1. Rhizoid is present in which of the genera?

(A) Rhizopus

(B) Cleviceps

(D) Dactylaria

Ans. A

2. Perithecium is found in which of the fungal genera?

(A) Rhizopus

(B) Cleviceps

(D) Dactylaria

Ans. B

3. Haustoria are found in which of the genera?

(A) Powdery mildew fungi

(B) Downy mildew fungi

(D) All of the above

Ans. D

4. Appressorium is found in which of the fungal genera?

(A) Puccinia

(B) Erysiphe

(D) All of the above

Ans. D

5. Trap is found in which fungal genera?

(A) Rhizopus

(B) Cleviceps

(D) All of the above

Ans. C

6. Which of the following is/are asexual fruiting body/bodies

(A) Pycnidia (Phomopsis)

(B) Acervulus (Colletotrichum, Gleosporium)

(D) All of the above

Ans. D

7. Synnemata (Ceratocystcs, Graphium) and Coremia (Penicillum claviforme, P. isariiforme) are ________

(A) Sexual fruiting bodies

(B) Asexual fruiting bodies

(D) None of the above

Ans. B

8. General process of sexual reproduction in fungi is ________

(A) Plasmogamy – Karyogamy – Meiosis

(B) Plasmogamy – Meiosis – Karyogamy

(D) None of the above

Ans. A

9. Which of the following is/are methods of plasmogamy in fungi during the process of sexual reproduction?

(A) Gametic copulation/Gametogamy (Plasmodiophora brassicae)

(B) Gametangial contact or Oogamy (Oomycetes)

(D) All of the above

Ans. D

10. Spermatization (Neurospora, Puccinia) and Somatogamy (Morchella, Agaricus) are _________

(A) Method of asexual reproduction

(B) Method of fungal modification

(D) None of the above

Ans. C

11. Which of the following is/are sexual fruiting body/bodies of fungi?

(A) Apothecium (Tuber, Peziza, Sclerotinia)

(B) Perithecium (Cleviceps, Xylaria, Nectria)

(D) All of the above

Ans. D

12. Ascostromata is found in Elsinoe which is a _____

(A) Sexual fruiting body

(B) Aseual fruiting body

(D) Asexual spore

Ans. A

13. The naked multinucleus mass of protoplasm is called as _____

(A) Mycelium

(B) Plasmodium

(D) Hyphae

Ans. B

14. Which kind of thallus is found in fungi?

(A) Plasmodium (Plasmodiophora)

(B) Unicellular (yeast)

(D) All of the above

Ans. D

15. Pseudo Plasmodium type thallus is produced by which group of fungi?

(A) Slime molds

(B) Rhizopus

(D) Oomycetes

Ans. A

16. Motile sporangiospores (Zoospores) produced by which group of fungi?

(A) Olpidium and Synchytrium

(B) Pythium and Phytophthora

(D) All of the above

Ans. D

17. Amotile sporangiospores (aplanospores) are produced in ______

(A) Rhizopus

(B) Mucor

(D) None of the above

Ans. C

18. Presence of Rhizoids, stolons and columellate sporangia is a typical feature of which fungus?

(A) Rhizopus

(B) Mucor

(D) Both A and B

Ans. A

19. Which of the following group/s of fungi is/are known as aquatic fungi?

(A) Chytridiomycetes (Olpidium, Synchytrium)

(B) Hypho chytridiomycetes

(D) All of the above

Ans. D

20. The organism which derive nutrient from living cells (host) for their growth are called parasite. Those organisms which derive nutrient always from living host/ tissues/ cells on which they complete their life cycle are called ______

(A) Obligate parasite (Biotrophs)

(B) Saprophytes

(D) Perthotroph/Necrotrophas

Ans. A

21. The organisms which attack living tissues in the same way as biotroph but can continue to grow and reproduce after the tissue is dead are called as _____

(A) Obligate parasite (Biotroph)

(B) Hemibiotroph (Facultative saprophyte)

(D) Symbiont

Ans. B

22. The organisms which derive their nutrient from dead organic matter is called as _____

(A) Saprophyte

(B) Parasite

(D) Symbiont

Ans. A

23. The organisms which kill host tissue in advance of penetration and then lives saprophytically are called as _____

(A) Facultative parasite

(B) Facultative saprophyte

(D) Saprophytes

Ans. C

24. The organism which live as saprophytes but under favourable conditions they attack living plants and become parasites, are called as _____

(A) Facultative parasites

(B) Facultative saprophytes

(D) Biotrophs

Ans. A

25. Which of the following are Biotrophs

(A) Synchytrium and Albugo

(B) Downy mildew fungi, Puccinia and Melampsora

(D) All of the above

Ans. D

26. Which of the following are Hemibiotrophs (facultative saprophytes)

(A) Smut fungi, Colletorichium

(B) Taphrina deformis, Drechslera

(D) Pythium

Ans. C

27. Which of the following is/are Necrotroph (Perthotrophs) fungi?

(A) Sclerotium, Sclerotinia

(B) Botryotinia, Botrytis

(D) All of the above

Ans. D

28. Which of the following is facultative parasitic fungi?

(A) Pythium, Phytophthora

(B) Fusarium

(D) All of the above

Ans. D

29. Genera Peronospora, Pseudoperonospora, Sclerospora, Peronosclerospora, Plasmopara, Bremia and Sclerophthora are called as _____

(A) Downy mildew fungi

(B) Powdery mildew fungi

(D) Rust fungi

Ans. A

30. The members of which group of fungi are commonly called as sac fungi, because of production of sexual spores i.e. ascospores (usually 8) in a sac like structure called ascus?

(A) Ascomycetes

(B) Basidiomycetes

(D) Zygomycetes

Ans. A

31. _____ type of asci based on structure of ascus wall

(A) Prototunicate ascus (Eurotinm)

(B) Unitunicate ascus (Claviceps)

(D) All of the above

Ans. D

32. Ascocarps are the fruiting bodies of sub-division Ascomycotina which produce the asci containing the ascospores. Types of ascocarps are _____

(A) Cleistothecium (Eurotium, Erysiphe)

(B) Perithecium (Claviceps, Xylaria)

(D) Ascostroma (Elsinoe)

(E) All of the above

Ans. E

33. Genera Erysiphe, Leveillula, Phyllactinia, Uncinula, Sphaerotheca, Podosphaera and Micosphaera are called as _____

(A) Downy mildew fungi

(B) Powdery mildew fungi

(D) Rust fungi

Ans. B

34. Which of the following is a type of cleistothecial appendages?

(A) Myceloid appendages (Erysiphe, Sphaerotheca, Leveillula)

(B) Circinoid/hooked/coiled appendages (Unicinula)

(D) All of the above

Ans. D

35. Bulbous base with pointed tip type cleistothecial appendages are found in _____

(A) Oidium

(B) Erysiphe

(D) Both A and B

Ans. C

36. Lysergic acid, erogometrine, ergonovine, ergotamine and cardycepine are alkaloids produced by _____

(A) Phomopsis

(B) Phoma

(D) Phyllactinia

Ans. C

37. An important alkaloid Ergotamine is one of the building blocks of the psychoactive drug Lysergic Acid Diethylamide (L.S.D.). This ergot alkaloid is being exploited for medicinal purpose

(A) Treatment of Migraines

(B) Induction of child birth

(D) All of the above

Ans. D

38. When the animals or human beings consume ergot contaminated grains or flour a serious disease occurs which is _____

(A) Ergotism (St. Anthony’s fire)

(B) Itching

(D) Blood coagulation

Ans. C

39. Members of which group of fungi are referred as club fungi?

(A) Basidiomycotina

(B) Ascomycotina

(D) None of the above

Ans. A

40. Which group of fungi includes mushrooms, toadstools, shelf fungi, Jelly fungi, puff balls, coral fungi, bracket fungi, birds nest fungi, stink horns, rusts and smuts

(A) Basidiomycotina

(B) Ascomycotina

(D) None of the above

Ans. A

41. The key character/s of Basidiomycotina fungi is/are _____

(A) Dikaryotic phase dominates the life cycle

(B) Presence of clamp connections on the mycelium

(D) All of the above

Ans. D

42. Group/s of basidiomycotina fungi which do not have clamp connection and dolipore septa its/their mycelium

(A) Rust

(B) Smut

(D) Both A and B

Ans. D

43. If rust fungi produce all the stages of spore on the same host then the fungus is called “autoecious” and the phenomenon is called “autoecism”. Which of the following are autoecious fungi?

(A) Melampsora lini – Flax or linseed rust

(B) Uromyces – appendiculatus – Bean rust

(D) All of the above

Ans. D

44. All the rust fungi must produce atleast

(A) Uredospore and Teliospore/Teleutospore

(B) Ureodospore and Basidiospore

(D) Teliospore only

Ans. C

45. If spore stages of a rust fungus are formed on two unrelated hosts, i.e. pycina and aecia on one host and uredia and telia on the other host, such rusts are called heteroecious rusts and phenomenon is called heteroecism. Which of the following fungi are heteroicous in nature?

(A) Puccinia graminis f. sp. tritici

(B) Puccinia graminis f. sp. recondita

(D) All of the above

Ans. D

46. Rusts, in which all the five spore forms are produced or produce atleast one type of binucleate/dikaryotic spore in addition to teleospores are called “Macrocyclic rusts” long cycled rust. It may be autoccious or heteroecious. Which is a macrocyclic rust?

(A) Sunflower rust – Puccinia helianthi

(B) Black stem rust of wheat – Puccinia graminis f. sp. tritici

(D) All of the above

Ans. D

47. The rust in which uredial stage is absent is called “Demicyclic rust”. The example of demicyclic rust is _____

(A) Cedar apple rust – Gymnosporangium juniperi-virginianae

(B) Rust of Horse parsley (Smyrnium olusatrum) – Puccinia smyrnii

(D) All of the above

Ans. D

48. Rust which do not produce binucleate (dikaryotic) spore other than teleospore and both aecia and uredia are lacking is called “Microcyclic rust” or “short cycled rust” short cycled rust is _____

(A) Hollyhock rust – Puccinia malvacearum

(B) Rust of Parthenium hysterophorus (Gajar ghas) – Puccinia melampodii

(D) All of the above

Ans. D

49. Which group of fungi is known as “fungi Imperfection” or “Dustbin fungi?

(A) Basidiomycotina

(B) Deuteromycotina

(D) Zygomycotina

Ans. B

50. Which of the following is known as “weed of the laboratory”

(A) Aspergillus

(B) Penicillium

(D) Mucor

Ans. A

51. Which fungus is known as “common contaminant of food material”, “laboratory contaminant” as well as “bread mold?”

(A) Aspergillus

(B) Penicillium

(D) Mucor

Ans. C

52. Which fungus cause “storage rots” of fruits and vegetables

(A) Aspergillus

(B) Penicillium

(D) Mucor

Ans. D

53. Bacteria are single called prokaryotic microorganisms. Distinct nucleus, nuclear membrane (envelope) nucleolus and membrane bound organelles like mitochondrion chloroplasts, endoplasmic reticulum, golgi bodies, lysosome, centriole, macrobiotics, cell membrane sterols are ____________ in bacteria

(A) Present

(B) Absent

(D) May absent

Ans. B

54. Nucleus of bacterial cell is called as _____

(A) Nucleoid

(B) Genophore

(D) All of the above

Ans. D

55. True chromosome is absent in bacterial cells. Each bacterial cell contains _____

(A) Single haploid chromosome

(B) Single diploid chromosome

(D) More than one diploid chromosome

Ans. A

56. Bacterial cell contains single ds circular naked DNA. In bacterial DNA histone is _____

(A) Present

(B) Absent

(D) May absent

Ans. B

57. Some bacterial cells are surrounded by a definite layer of viscous or gelatinous substance for protection against temporary drying of bacterial cell is known as _____

(A) Cell wall

(B) Slime

(D) Endospore

Ans. C

58. Function of bacterial capsule is _____

(A) Provide protection against temporary drying

(B) Protect bacterial cells from W. B. C. and also help in colony formation

(D) All of the above

Ans. D

59. The bacterial organelle which contains DNA is called _____

(A) Nucleotide

(B) Chromatin body

(D) All of the above

Ans. D

60. Capsule in Bacteria is made up of _____

(A) Polysaccharide

(B) Protein

(D) Glycoprotein

Ans. A

61. A thin hair like, filamentous structure that protrude through the cell wall and are responsible for swimming motility in bacteria are called flagella which are composed of _____

(A) Pillin protein

(B) Flagellin protein

(D) None of the above

Ans. B

62. Pili are hollow, non-helical, filamentous appendages that are thinner, shorter and more numerous than flagella are composed of _____

(A) Pilin protein

(B) Flagellin protein

(D) Polysaccharide

Ans. A

63. Pili are found

(A) Only in non-pathogenic bacteria

(B) Only in pathogenic bacteria

(D) None of the above

Ans. B

64. All the bacteria have rigid cell wall that gives shape to the cell. The cell wall of bacteria/prokaryote is made up of _____

(A) Peptidoglycan/Murein

(B) Protein only

(D) Lipid only

Ans. A

65. Pcptidoglycan is also known as _____

(A) Murein

(B) Mucopeptide

(D) None of the above

Ans. C

66. A typical size of bacterial cell is _____

(A) 0.1 – 0.5 x 0.2 – 0.5 µm

(B) 0.2 – 1.5 mm x 3.0 – 5.0 µm

(D) None of the above

Ans. B

67. The cell wall may account for _____ of the dry weight of the bacterial cell

(A) 10-40%

(B) 40-50%

(D) 50-60%

Ans. A

68. Murien or peptidoglycan layer is composed of two types of components

(A) Aminosugars (Polysaccharides)

(B) Amino acids

(D) None of the above

Ans. C

69. Polysaccharide of murein is composed of glucose, mannose, galactose and two types of amino sugars, N- acetyl muramic acid (NAM or MA) and N – Acetyl glucosamine (NAG or GA). These two aminosugars are present alternatively (i.e. NAM – NAG – NAM – NAG) and are linked through ___________ linkage/bond

(A) β, 1, 2 glycosidic linkage

(B) β, 1, 4 glycosidic linkage

(D) None of the above

Ans. B

70. The NAM aminosugar units contain a short peptide side chain of 4 amino acids. The most common sequence of amino acids is _____

(A) L – alanine, D – alanine, D – glutamic or diaminopimelic acid

(B) L – alanine, L- lysine or diaminopimelic acid, D – alanine and acid D – glutamic acid

(D) None of the above

Ans. C

71. Diaminopimelic acid and muramic acid are present in cell wall of _____

(A) Cell wall of Gram + ve bacteria

(B) Cell wall of Gram -ve bacteria

(D) All of the above algae (BGA)

Ans. D

72. Teichoic (Lipoteichoic) acids are polymers of ribitol and glycerol. They serve as antigen and also regulate entry of ions. Teichoic acid is found in _____

(A) Gram +ve Eubacteria only

(B) Gram -ve eubacteria only

(D) None of the above

Ans. A

73. In some bacteria peptidoglycan is not present in their cell wall in these bacteria cell wall is composed of cellulose which is/are _____

(A) Acetobacter acetogenum

(B) Acetobacter xylemtm

(D) All of the above

Ans. D

74. In gram +ve Eubacteria, cell wall is single layer with thickness of _____

(A) 10-15 nm

(B) 20-25 nm

(D) 25 – 30 nm

Ans. B

75. In gram -ve Eubacteria, cell wall is double layered (i.e. Inner wall and outer membrane). What is the total thickness of cell wall of gram -ve bacteria or Eubacteria

(A) 10-15 nm

(B) 15-20nm

(D) 20-25 nm

Ans. A

76. The thickness of murein layer in cell wall of gram +ve and gram –ve bacteria are 100 Å and 25-30 Å respectively. What is the proportion of murein to the cell wall composition?

(A) 20 – 30 % in gram +ve and 20% in gram –ve

(B) 35 – 40 % in gram +ve and 5 – 7% in gram –ve

(D) > 95 % in gram +ve and 30 % in gram –ve

Ans. C

77. Number of murein layer in Eubacteria is _____

(A) In gram +ve multilayered

(B) In gram -ve monolayered

(D) None of the above

Ans. C

78. Status of Glycolipid in cell wall of Bacteria is _________

(A) Present in gram +ve

(B) Present in gram -ve

(D) None of the above

Ans. C

79. Cell wall components like Periplasmic space, lipoprotein, lipopolysaccharide and porin in outer membrane are _____

(A) Absent in gram +ve

(B) Present in gram –ve

(D) Present in both gram +ve and gram –ve

Ans. C

80. Number of rings present in flagella of bacteria are ___________

(A) 2 (S and m rings) in gram +ve bacteria

(B) 4 (L, P, S and M rings) in gram – ve bacteria

(D) None of the above

Ans. C

81. The cell wall of gram –ve bacteria is double layered, inner layer and outer layer (membrane). Inner layer is thin and made up of peptidoglycan and outer membrane is thick and made up of ______ some quantity of lipoprotein and phospholipid is also present in outer layer

(A) Lipid only

(B) Lipopoly saccharides (LPS)

(D) Murien only

Ans. B

82. The main function of cell wall is _____

(A) To prevent cell wall from mechanical damage

(B) To protect cell from osmotic rupture of lysis

(D) Both A and B

Ans. D

83. Mesosomes are internal invagination of cytoplasmic membrane which are _____

(A) More prominent in gram +ve bacteria

(B) Less prominent in gram –ve bacteria

(D) More prominent in both gram +ve and gram –ve

Ans. C

84. Result of lysozyme enzyme digestion or activity of bacteria is _____

(A) Protoplast for gram +ve bacteria

(B) Sphaeroplast for gram –ve bacteria

(D) Protoplast for both gram +ve and gram –ve

Ans. C

85. Bacterial cell membrane is composed of protein and phospholipid. The cytoplasmic membrane contains _____

(A) 50% Proteins

(B) 25% Lipids

(D) All of the above

Ans. D

86. On the basis of extent of the removal of cell wall and ability to reproduce _____ types of wall less bacteria are known

(A) 3

(B) 2

(D) 4

Ans. A

87. Which is/are the wall less bacteria

(A) Protoplast

(B) Sphaeroplast

(D) All of the above

Ans. D

88. A protoplast is a complete wall free bacterial cell which is bound only by the plasma membrane and obtained mostly by gram +ve bacteria. A protoplast is _________

(A) Able to synthesize

(B) Not able to resynthesize

(D) None of the above

Ans. B

89. A sphaeroplast is a bacterial cell with damaged cell wall obtained mostly from gram –ve bacteria. A sphaeroplast

(A) Can resynthesize

(B) Cannot resynthesize

(D) None of the above

Ans. A

90. L – form or lister form is a protoplast or sphaeroplast – like body capable of growth and multiplication in this form L – forms are formed in bacteria — infected animals. Which of the following can produce L – form

(A) Pseudomonas and Erwinia

(B) Bacillus anthracis

(D) Both B and C

Ans. D

Botany, Plant Pathology, MCQs on Plant Pathology for Students

Cookie	Duration	Description
cookielawinfo-checkbox-analytics	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional	11 months	The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy	11 months	The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.

Agriculture in India