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