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Latest ASRB ARS Plant Pathology Exam Question (Objective Questions), MCQ in English

Subjects : Plant Pathology

Question Bank ASRB ARS (Plant Pathology) Preliminary Exam - English
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Plant Pathology

Question 1Single Answer
Who is known as the "Father of Plant Pathology"?
  1. A
    Anton de Bary
  2. B
    E. J. Butler
  3. C
    H. Marshall Ward
  4. D
    Robert Koch
Question 2Single Answer
Which scientist first demonstrated that fungi cause plant diseases?
  1. A
    Theodor Hartig
  2. B
    Anton de Bary
  3. C
    E. J. Butler
  4. D
    Louis Pasteur
Question 3Single Answer
Who proposed the concept of "Physiologic Races" in plant pathogens?
  1. A
    H. H. Flor
  2. B
    E. J. Butler
  3. C
    Anton de Bary
  4. D
    H. Marshall Ward
Question 4Single Answer
Which Indian scientist made significant contributions to fungal taxonomy and plant pathology?
  1. A
    K. C. Mehta
  2. B
    E. J. Butler
  3. C
    B. B. Mundkur
  4. D
    S. D. Garrett
Question 5Single Answer
Who discovered the role of bacteria in causing fire blight of pear?
  1. A
    T. J. Burrill
  2. B
    H. H. Flor
  3. C
    E. F. Smith
  4. D
    K. C. Mehta
Question 6Single Answer
Which disease led to the Irish Potato Famine in the 1840s?
  1. A
    Late blight of potato
  2. B
    Rust of wheat
  3. C
    Downy mildew of grapes
  4. D
    Bacterial wilt
Question 7Single Answer
What is the causal organism of the Irish Potato Famine?
  1. A
    Phytophthora infestans
  2. B
    Puccinia graminis
  3. C
    Alternaria solani
  4. D
    Xanthomonas campestris
Question 8Single Answer
Which plant disease caused severe losses in Bengal in 1943, leading to famine?
  1. A
    Brown spot of rice
  2. B
    Black rust of wheat
  3. C
    Late blight of potato
  4. D
    Coffee rust
Question 9Single Answer
Which pathogen caused the Bengal Famine of 1943?
  1. A
    Magnaporthe oryzae
  2. B
    Helminthosporium oryzae
  3. C
    Xanthomonas oryzae
  4. D
    Puccinia striiformis
Question 10Single Answer
Which disease nearly wiped out coffee plantations in Sri Lanka in the 19th century?
  1. A
    Leaf rust of coffee
  2. B
    Downy mildew of grape
  3. C
    Ergot of rye
  4. D
    Smut of sugarcane
Question 11Single Answer
Who introduced the concept of "Disease Triangle" in plant pathology?
  1. A
    G. M. Huber
  2. B
    J. C. Walker
  3. C
    E. J. Butler
  4. D
    R. W. Schneiter
Question 12Single Answer
Which scientist formulated Koch’s Postulates?
  1. A
    Anton de Bary
  2. B
    Robert Koch
  3. C
    E. F. Smith
  4. D
    H. H. Whetzel
Question 13Single Answer
Who is credited with developing the Bordeaux mixture as the first fungicide?
  1. A
    H. Marshall Ward
  2. B
    Pierre-Marie-Alexis Millardet
  3. C
    Anton de Bary
  4. D
    T. J. Burrill
Question 14Single Answer
What is the main component of Bordeaux mixture?
  1. A
    Copper sulfate and lime
  2. B
    Sulfur and lime
  3. C
    Zinc sulfate and lime
  4. D
    Magnesium sulfate and sulfur
Question 15Single Answer
Who first discovered biological control of plant diseases?
  1. A
    E. J. Butler
  2. B
    Louis Pasteur
  3. C
    Paul Vuillemin
  4. D
    Robert Koch
Question 16Single Answer
Which is the first systemic fungicide introduced for plant disease control?
  1. A
    Carbendazim
  2. B
    Captan
  3. C
    Benomyl
  4. D
    Sulfur
Question 17Single Answer
Which Act regulates the quarantine of plant material in India?
  1. A
    Plant Quarantine Act (1914)
  2. B
    Insecticide Act (1968)
  3. C
    Seed Act (1966)
  4. D
    Protection of Plant Varieties Act (2001)
Question 18Single Answer
Which method is not a cultural practice for disease management?
  1. A
    Crop rotation
  2. B
    Field sanitation
  3. C
    Solarization
  4. D
    Chemical fumigation
Question 19Single Answer
Which technique involves exposing soil to the sun to kill pathogens?
  1. A
    Solarization
  2. B
    Crop rotation
  3. C
    Mulching
  4. D
    Soil fumigation
Question 20Single Answer
What is the primary purpose of a quarantine regulation in plant pathology?
  1. A
    Improve soil fertility
  2. B
    Control pest resistance
  3. C
    Prevent the introduction of exotic pathogens
  4. D
    Increase crop yield
Question 21Single Answer
Which classification system categorizes plant diseases based on symptoms?
  1. A
    Morphological classification
  2. B
    Symptomatological classification
  3. C
    Pathogenetic classification
  4. D
    Epidemiological classification
Question 22Single Answer
Which classification system groups plant diseases based on causal agents?
  1. A
    Etiological classification
  2. B
    Symptomatological classification
  3. C
    Economic classification
  4. D
    Morphological classification
Question 23Single Answer
Which of the following is a biotrophic pathogen?
  1. A
    Fusarium oxysporum
  2. B
    Xanthomonas campestris
  3. C
    Puccinia graminis
  4. D
    Botrytis cinerea
Question 24Single Answer
Which type of pathogen can complete its lifecycle on dead organic matter?
  1. A
    Biotrophic
  2. B
    Necrotrophic
  3. C
    Hemibiotrophic
  4. D
    None of the above
Question 25Single Answer
Which classification method considers the economic importance of plant diseases?
  1. A
    Symptomatological classification
  2. B
    Morphological classification
  3. C
    Economic classification
  4. D
    Pathogenetic classification
Question 26Single Answer
Who first described the life cycle of wheat rust (Puccinia graminis)?
  1. A
    Anton de Bary
  2. B
    H. H. Flor
  3. C
    E. J. Butler
  4. D
    K. C. Mehta
Question 27Single Answer
Who discovered the concept of gene-for-gene interaction in plant pathology?
  1. A
    H. H. Flor
  2. B
    E. F. Smith
  3. C
    K. C. Mehta
  4. D
    J. C. Walker
Question 28Single Answer
Which scientist is known as the "Father of Indian Plant Pathology"?
  1. A
    B. B. Mundkur
  2. B
    K. C. Mehta
  3. C
    E. J. Butler
  4. D
    M. J. Thirumalachar
Question 29Single Answer
Which scientist first discovered Tobacco Mosaic Virus (TMV)?
  1. A
    Martinus Beijerinck
  2. B
    Dmitri Ivanovsky
  3. C
    Robert Koch
  4. D
    H. H. Flor
Question 30Single Answer
Who demonstrated that viruses could pass through bacterial filters?
  1. A
    Martinus Beijerinck
  2. B
    Dmitri Ivanovsky
  3. C
    Louis Pasteur
  4. D
    Pierre-Marie-Alexis Millardet
Question 31Single Answer
Which disease is responsible for the Southern Corn Leaf Blight epidemic in the USA (1970)?
  1. A
    Bipolaris maydis
  2. B
    Phytophthora infestans
  3. C
    Puccinia graminis
  4. D
    Magnaporthe oryzae
Question 32Single Answer
Which pathogen caused the great Bengal famine in 1943?
  1. A
    Helminthosporium oryzae
  2. B
    Xanthomonas oryzae
  3. C
    Magnaporthe oryzae
  4. D
    Ustilago maydis
Question 33Single Answer
The Panama disease epidemic devastated which major crop?
  1. A
    Wheat
  2. B
    Banana
  3. C
    Sugarcane
  4. D
    Cotton
Question 34Single Answer
What is the causal organism of Panama disease?
  1. A
    Fusarium oxysporum f. sp. cubense
  2. B
    Xanthomonas campestris
  3. C
    Ustilago scitaminea
  4. D
    Phytophthora infestans
Question 35Single Answer
Coffee rust disease, which severely affected coffee production in Sri Lanka, is caused by:
  1. A
    Hemileia vastatrix
  2. B
    Puccinia graminis
  3. C
    Xanthomonas axonopodis
  4. D
    Ralstonia solanacearum
Question 36Single Answer
Which fungicide was the first to be used as a seed treatment?
  1. A
    Copper sulfate
  2. B
    Sulfur
  3. C
    Mercury-based compounds
  4. D
    Bordeaux mixture
Question 37Single Answer
Which scientist first suggested using resistant varieties to control plant diseases?
  1. A
    E. J. Butler
  2. B
    H. H. Flor
  3. C
    E. F. Smith
  4. D
    N. I. Vavilov
Question 38Single Answer
Who first used heat treatment for disease control in plants?
  1. A
    Louis Pasteur
  2. B
    R. W. Schneiter
  3. C
    M. J. Thirumalachar
  4. D
    Anton de Bary
Question 39Single Answer
Which act regulates pesticide usage in India?
  1. A
    Seed Act, 1966
  2. B
    Insecticides Act, 1968
  3. C
    Plant Quarantine Act, 1914
  4. D
    Protection of Plant Varieties Act, 2001
Question 40Single Answer
Which modern technique is widely used to diagnose plant diseases at an early stage?
  1. A
    ELISA
  2. B
    PCR
  3. C
    DNA barcoding
  4. D
    All of the above
Question 41Single Answer
Which classification groups plant diseases based on their mode of transmission?
  1. A
    Etiological classification
  2. B
    Symptomatological classification
  3. C
    Epidemiological classification
  4. D
    Economic classification
Question 42Single Answer
Which pathogen classification is based on the method of pathogenesis?
  1. A
    Biotrophic and necrotrophic
  2. B
    Soilborne and airborne
  3. C
    Fungal and bacterial
  4. D
    Systemic and localized
Question 43Single Answer
Which type of plant disease is caused by nutritional imbalances?
  1. A
    Parasitic
  2. B
    Non-parasitic
  3. C
    Systemic
  4. D
    Localized
Question 44Single Answer
Which classification of plant diseases is based on plant part affected?
  1. A
    Morphological classification
  2. B
    Symptomatological classification
  3. C
    Pathogenetic classification
  4. D
    Economic classification
Question 45Single Answer
The term “damping-off” refers to:
  1. A
    Wilting of seedlings due to Fusarium
  2. B
    Seedling death due to fungal infection
  3. C
    Sudden drying of leaves
  4. D
    None of the above
Question 46Single Answer
What does IPM stand for in plant pathology?
  1. A
    Integrated Pest Management
  2. B
    International Plant Monitoring
  3. C
    Integrated Plant Management
  4. D
    Indian Plant Management
Question 47Single Answer
Which biological control agent is effective against soil-borne fungal pathogens?
  1. A
    Bacillus thuringiensis
  2. B
    Trichoderma spp.
  3. C
    Xanthomonas campestris
  4. D
    Pseudomonas fluorescens
Question 48Single Answer
Which act governs plant quarantine measures in India?
  1. A
    Plant Protection Act, 1980
  2. B
    The Destructive Insects and Pests Act, 1914
  3. C
    Pesticide Regulation Act, 1968
  4. D
    FSSAI Act, 2006
Question 49Single Answer
Which technology is used in the detection of viral plant pathogens?
  1. A
    PCR
  2. B
    ELISA
  3. C
    DNA fingerprinting
  4. D
    All of the above
Question 50Single Answer
What is the primary function of a quarantine regulation in plant pathology?
  1. A
    Improve crop yield
  2. B
    Prevent the spread of exotic plant diseases
  3. C
    Reduce soil erosion
  4. D
    Increase disease resistance
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