Quiz_Plant_Pathogens

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

 
 
 
 

2. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

6. Pythium debaryanum is the causative agent of:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

10. Etiology includes the study of :

 
 
 
 

11. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

14. Disease resistant plant varieties can be produced by :

 
 
 
 

15. The disease symptom necrosis refers to :

 
 
 
 

16. Banana bunchy top is caused by :

 
 
 
 

17. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

19. Smut of maize is caused by :

 
 
 
 

20. Red rot of sugarcane is caused by :

 
 
 
 

21. Black rust of wheat is caused by:

 
 
 
 

22. Mixed cropping helps :

 
 
 
 

23. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

29. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

36. Leaf spot of groundnut is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

39. Citrus canker is caused by :

 
 
 
 

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

 
 
 
 

41. Downy mildew disease is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

45. Ergot is obtained from :

 
 
 
 

46. Chief constituents of bordeaux mixture are :

 
 
 
 

47. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

51. Quarantine regulations are concerned with: