Quiz_Plant_Pathogen

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

4. Citrus canker is caused by :

 
 
 
 

5. Downy mildew disease is caused by :

 
 
 
 

6. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

8. Smut of maize is caused by :

 
 
 
 

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

 
 
 
 

10. Disease resistant plant varieties can be produced by :

 
 
 
 

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

 
 
 
 

12. Pythium debaryanum is the causative agent of:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

15. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

18. Quarantine regulations are concerned with:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

26. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

29. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

32. Chief constituents of bordeaux mixture are :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

37. Etiology includes the study of :

 
 
 
 

38. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

41. Mixed cropping helps :

 
 
 
 

42. Black rust of wheat is caused by:

 
 
 
 

43. Banana bunchy top is caused by :

 
 
 
 

44. Late blight of potato is caused by :

 
 
 
 

45. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

47. Small epidermal swellings due to infection are called :

 
 
 
 

48. The disease symptom necrosis refers to :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

51. Leaf spot of groundnut is caused by :

 
 
 
 


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