Quiz_Plant_Pathogen

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1. A disease is abnormal state that may result due to :

 
 
 
 

2. A part of pathogen that is transmitted to the host is termed as :

 
 
 
 

3. A branch of science that deals with nature, symptoms, development and control of plant diseases is called :

 
 
 
 

4. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

5. In plants, the substances which accumulate around the site of infection are :

 
 
 
 

6. Etiology includes the study of :

 
 
 
 

7. Which of the following is not a fungal disease?

 
 
 
 

8. There is a class of phenolic compounds produced by the host plant in response to fungal infections :

 
 
 
 

9. Severe famine of West Bengal of 1942-43 was due to destruction of rice crop by a fungus called :

 
 
 
 

10. Smut of maize is caused by :

 
 
 
 

11. Aflatoxin is produced as a product in :

 
 
 
 

12. Which of the following does not help in penetration of pathogen into the host?

 
 
 
 

13. Which of the following is not a correct match?

 
 
 
 

14. Citrus canker is caused by :

 
 
 
 

15. Small epidermal swellings due to infection are called :

 
 
 
 

16. Black rust of wheat is caused by:

 
 
 
 

17. Red rot of sugarcane is caused by :

 
 
 
 

18. Which of the following is not a viral disease?

 
 
 
 

19. Which part of the plant is not affected by Albugo?

 
 
 
 

20. Which of the following statements is not correct?

 
 
 
 

21. The smut mycelium which initiates the infection is usually :

 
 
 
 

22. The pathogen that causes covered smut of Sorghum is :

 
 
 
 

23. Chemicals which are applied soon after the outset of infection, suppress the development of pathogen, thus curing the plant, are called :

 
 
 
 

24. An excessive enlargement of diseased organ because of increase in the number of cells is called :

 
 
 
 

25. Pythium debaryanum is the causative agent of:

 
 
 
 

26. Red rot of sugarcane is caused by :

 
 
 
 

27. Propagating materials like seeds, tubers, grafts and bulbs can be kept free of pathogens by :

 
 
 
 

28. The disease symptom necrosis refers to :

 
 
 
 

29. The scientist who is famous for his research on rust fungi in India is :

 
 
 
 

30. The causal organism of early blight of potato is :

 
 
 
 

31. Ergot is obtained from :

 
 
 
 

32. Downy mildew disease is caused by :

 
 
 
 

33. If a disease appear on large scale after a long interval it is :

 
 
 
 

34. Body disorders due to harmful physiological changes are known as :

 
 
 
 

35. There are some dead and corky areas with definite margins on the stem, branches and fruits of lemon. This disease should be :

 
 
 
 

36. The disease occurring more or less regularly from year to year in a particular locality is referred to as :

 
 
 
 

37. Which of the following causes smut disease in cultivated plants?

 
 
 
 

38. Banana bunchy top is caused by :

 
 
 
 

39. Leaves of pea show white powdery patches due to the growth of fungal mycelium with conidia and conidiophores. These are the symptoms of :

 
 
 
 

40. When a diseased plant is legally stopped from export, this is done under :

 
 
 
 

41. Chief constituents of bordeaux mixture are :

 
 
 
 

42. When an infection is very wide in occurrence, it is called :

 
 
 
 

43. A control measure prior to the appearance of a particular disease comes under :

 
 
 
 

44. Mixed cropping helps :

 
 
 
 

45. The inability of a plant to resist the effects of a pathogen or any other damaging factors is known as :

 
 
 
 

46. Leaf spot of groundnut is caused by :

 
 
 
 

47. Late blight of potato is caused by :

 
 
 
 

48. A diseased leaf shows some areas with dead tissue. This symptom is often referred to as :

 
 
 
 

49. Disease resistant plant varieties can be produced by :

 
 
 
 

50. Quarantine regulations are concerned with:

 
 
 
 

51. Which of the following is the most destructive enemies of mankind?

 
 
 
 


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