Plant Pathology Objective Type Questions and Answers with PDF

A comprehensive and updated question bank of multiple choice objective practice questions and answers on Plant Pathology for Competitive Exams like General Agriculture for ICAR and other JRF, SRF, ARS, Ph.D., M.Sc., IBPS, AFO, AO, IFS, NABARD and Tests.

1. The first Indian scientist who collected and identified fungi in India–
(A) EJ Butler (B) KR Kirtikar✓
(C) JF Dastur (D) KC Mehta

2. JC Luthra and his associates developed the solar heat treatment of wheat seeds for the control of–
(A) Black rust (B) Loose smut✓
(C) Seed gall (D) Brown rust

3. The scientific name of burrowing nematode is–
(A) Xiphinema sp. (B) Lougidorus sp.
(C) Meloidogune sp. (D) Radopholus sp.✓

4. The pathogen of rice blast or ‘rotten neck’ is–
(A) Ustilago tritici (B) Pyricularia oryzae✓
(C) Alternaria altemata (D) None of these

5. Tea rust is caused by–
(A) MLO (B) Virus
(C) Bacteria (D) Algae ✓

6. The incidence of black scurf of potato is more in–
(A) Sandy soil✓ (B) Clay soil
(C) Alluvial soil (D) Loam soil

7. Teliospore of rust have germpores in number–
(A) 1 (B) 2✓
(C) 3 (D) 4

8. In 2005 which pathological scientist got Borlaug award–
(A) Rattan Lal (B) VL Chopra
(C) CD Mayee (D) S Nagarajan✓

9. The downey mildew disease of pearlmillet is primarily a–
(A) Seed borne (B) Air borne
(C) Soil borne✓ (D) Water borne

10. Renowned scientist Dr. N.E. Borlaug belongs to–
(A) Agronomy (B) Genetics
(C) Entomology (D) Plant Pathology✓

11. The powdery mildew of wheat is associated with fungi–
(A) Enjsiphe graminis sp. tritici✓ (B) E. graminis sp. hordei
(C) Enjsiphe polsjgoni (D) None of these

12. Most widely used fungicide for rust fungi is–
(A) Vitavax (B) Plantvax✓
(C) Bavistin (D) Dithane M -45

13. Who is the father of Mycology ?
(A) EJ Butler (B) AP Michelli✓
(C) Woronine (D) Anton de Bary

14. The science which deals with cause of the plant diseases and nature of the causal agent–
(A) Fertilization (B) Etiology
(C). Aetiology (D) Both (B) & (C)✓

15. Select the disease in which small droplets of pinks or light honey coloured–
fluid (the honeydew stage) exudes from the spikelets–
(A) Citrus canker (B) Green ear diseases of bajra
(C) Ergot of bajra✓ (D) Bacterial blight of rice

16. Potato spindle tuber disease is transmitted–
(A) Mechanically✓ (B) Biologically
(C) Water (D) All of these

17.  Burgundy mixture contains sodium carbonate in place of Ca C03 as in Bordeaux mixture was discovered in
(A) 1885 (B) 1887✓
(C) 1890 (D) 1947

18. Potato virus diseases are spread by –
(A) Aphids✓ (B) Jassids
(C) Nematodes (D) Tuber moth

19. The cauliflower mosaic virus particles contain–
(A) RNA (B) DNA✓
(C) Both (A) and (B) (D) Either RNA or DNA

20. The plants produce a whip like black shoot, often very long and much curved–
on itself in smut of sugarcane is caused by pathogen–
(A) Ustilngo nuda (B) Ustilngo ti tici
(C) Ustilngo ecitnmiuea✓ (D) Ustilngo hordei

21. The fungi which transmit plant viruses belong to class–
(A) Basidiomycetes (B) Oomycetes
(C) Zygomyctes (D) Plasmodiophoromycetes✓

22. The green ear or downey mildew of pearlmillet was first time reported in India by–
(A) KC Mehta (B) E J Butler✓
(C) Mundakur (D) R. Prasad

23. Black rust or stem rust of wheat is raused by –
(A) Puccinia gramiuis tritici✓ (B) Puccinia strifonnis
(C) Puccinia recondita (D) Melampsora lini

24. Which systemic fungicide was first time discovered by Yon Schmeling and Kulka?
(A) Oxathiin✓  (B) Pyrimidines
(C) Benzimidazoles (D) Quinones

25. All plant viruses (except cauliflower mosaic virus) contain–
(A) DNA (B) RNA✓
(C) Both RNA and DNA (D) Either RNA or DNA

26. The effective control of flag smut of wheat (Urocystis tritici) can be done by adopting of–
(A) Use of resistant varieties (B) Seed treatment
(C) Crop rotation (D) All of these✓

27. Kamal bunt of wheat first time reported in Kamal by Mitra in–
(A) 1929 (B) 1931
(C) 1941 (D) 1951✓

28. Smut of maize caused by–
(A) Ustilago tritici (B) Ustilago maydis✓
(C) Ustilago hordei (D) None of these

29. The Colletotrichutn alcatum produces –
(A) Zygospores (B) Oospores
(C) Ascospores (D) Conidiospores✓

30. Infection of smut of maize (Ustilago maydis) occurs during–
(A) Vegetative stage✓ (B) Reproductive stage
(C) After flowering (D) Before sowing

31. Early blight of potato produces –
(A) Conidia✓ (B) Telia
(C) Uredia (D) Acecia

32. Who is the father of American Nematology ?
(A) Kuhn (B) H Schacht
(C) NA Cobb✓ (D) T J Burill

33. Brown leaf spot disease of rice is caused by–
(A) Drechslera oryzae✓ (B) Cercospora arachidicola
(C) Xauthomonas onJzae (D) Pyricularia onJzae

34. The nematode Heterodera auenae is confined to the gramineae family except one single legume–
(A) Piston satitntnt (B) Cajanus cajan
(C) Vigna mungo (D) Senebiera pinnatifolia✓

35. The effective control of lat blight of potato is possible by use of–
(A) Sanitation measures (B) Spray of metalaxyl
(C) Bordeaux mixture (D) All of these✓

36. Which fungicide is used against downey mildew?
(A) Metalaxyl✓  (B) Karathane
(C) Oxathin (D) Streptomycin

37. MLO disease transmitted by–
(A) Leaf hopper✓ (B) Aphid
(C) Whitefly (D) Animals

38. The common bunt, stinking smut or hill bunt of wheat is caused by a pathogen –
(A) Tilletia tritici (B) Tilletia foetida
(C) Roth (A) and✓ (B) (D) Neovossia indica

39. Nematicides inhibits which enzyme of nervous system in killing of nematodes–
(A) Kinase (B) Isomerase
(C) Phosphatase (D) Acetyl cholinesterase ✓

40. Virus capsid is made up of–
(A) Protein✓ (B) Carbohydrate
(C) Lipid (D) Nucleic acid

41. How many ascospores are enclosed in the mother cell, the ascus in ascomycetes ?
(A) 4 (B) 6
(C) 8✓
(D) 10

42. Karnal bunt of wheat gives foul smell in the field due to presence of volatile compound–
(A) Tetramethyl amine (B) Trimethyl amine✓
(C) Diallyl propyl sulphide (D) Allyl propyl disulphide

43. Father of Indian Mycology–
(A) EJ Butler✓ (B) KC Mehta
(C) Mundakur (D) RS Singh

44. Common scab of potato can be controlled by reducing pH below 5.2 is caused by the pathogen–
(A) Streptomyces scabies✓ (B) Streptomyces griseus
(C) Streptomyces aureofaciens (D) Streptomyces flaueolus

45. In 1845, the late blight of potato destroyed the potato crop of Ireland was caused by–
(A) Phsjtophthora infestaus✓ (B) Alternaria solani
(C) Pythium aphanidermatutn (D) Pseudomonas solanacearum

46. The fungus of Drechslera oryzae produces toxins which are highly toxic to rice seedling, name of such toxin is–
(A) ABA (B) Trimethyl amine
(C) Isobutylene (D) Cochliobolin✓

47. Bacterial diseases are controlled by use of chemicals–
(A) Kelthane (B) Fungicide
(C) Antibiotics✓ (D) Viricides

48. Ozone is toxic to expanding leaves of almost all types of plant at the concentration of equal or more than–
(A) 0.1 ppm✓ (B) 0.2 ppm
(C) 0.3 ppm (D) 0.5 ppm

49. The symptoms of powdery mildew of pea (caused by Erusiphe polygoni) first appears on–
(A) Stem (B) Roots
(C) Leaves✓ (D) Flowers

50. MLO first discovered by–
(A) Louis Pasteur (B) Kuch
(C) Doi✓ (D) Anupam Verma

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