Quiz_Plant_Pathogen

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1. Citrus canker is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

4. Mixed cropping helps :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

7. Banana bunchy top is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

10. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

12. Smut of maize is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

17. Disease resistant plant varieties can be produced by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

20. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

24. Quarantine regulations are concerned with:

 
 
 
 

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

 
 
 
 

26. Downy mildew disease is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

29. The disease symptom necrosis refers to :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

34. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

35. Chief constituents of bordeaux mixture are :

 
 
 
 

36. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

38. Late blight of potato is caused by :

 
 
 
 

39. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

41. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

44. Black rust of wheat is caused by:

 
 
 
 

45. Leaf spot of groundnut is caused by :

 
 
 
 

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

 
 
 
 

47. Pythium debaryanum is the causative agent of:

 
 
 
 

48. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

50. Etiology includes the study of :

 
 
 
 

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

 
 
 
 


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