Quiz_Plant_Pathogen

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

4. Downy mildew disease is caused by :

 
 
 
 

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

 
 
 
 

6. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

8. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

11. Leaf spot of groundnut is caused by :

 
 
 
 

12. Black rust of wheat is caused by:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

17. Which of the following statements is not correct?

 
 
 
 

18. Disease resistant plant varieties can be produced by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

22. Pythium debaryanum is the causative agent of:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

26. Mixed cropping helps :

 
 
 
 

27. Etiology includes the study of :

 
 
 
 

28. Smut of maize is caused by :

 
 
 
 

29. Citrus canker is caused by :

 
 
 
 

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

 
 
 
 

31. Quarantine regulations are concerned with:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

35. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

37. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

40. The disease symptom necrosis refers to :

 
 
 
 

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

 
 
 
 

42. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

46. Red rot of sugarcane is caused by :

 
 
 
 

47. Chief constituents of bordeaux mixture are :

 
 
 
 

48. Banana bunchy top is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

51. Helminthosporium oryzae was the cause of disaster :

 
 
 
 


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