Quiz_Plant_Pathogens

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

 
 
 
 

2. Banana bunchy top is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

7. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

10. Mixed cropping helps :

 
 
 
 

11. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

13. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

15. Chief constituents of bordeaux mixture are :

 
 
 
 

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

 
 
 
 

17. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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. The disease symptom necrosis refers to :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

25. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

28. Smut of maize is caused by :

 
 
 
 

29. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

31. Quarantine regulations are concerned with:

 
 
 
 

32. Black rust of wheat is caused by:

 
 
 
 

33. Etiology includes the study of :

 
 
 
 

34. Pythium debaryanum is the causative agent of:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

38. Leaf spot of groundnut is caused by :

 
 
 
 

39. Disease resistant plant varieties can be produced by :

 
 
 
 

40. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

43. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

49. Citrus canker is caused by :

 
 
 
 

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

 
 
 
 

51. Downy mildew disease is caused by :