Quiz_Plant_Pathogens

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

 
 
 
 

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

 
 
 
 

3. Etiology includes the study of :

 
 
 
 

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

 
 
 
 

5. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

7. Citrus canker is caused by :

 
 
 
 

8. Banana bunchy top is caused by :

 
 
 
 

9. Chief constituents of bordeaux mixture are :

 
 
 
 

10. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

12. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

19. Aflatoxin is produced as a product in :

 
 
 
 

20. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

23. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

27. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

32. Smut of maize is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

38. Disease resistant plant varieties can be produced by :

 
 
 
 

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

 
 
 
 

40. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

43. Downy mildew disease is caused by :

 
 
 
 

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

 
 
 
 

45. The disease symptom necrosis refers to :

 
 
 
 

46. Pythium debaryanum is the causative agent of:

 
 
 
 

47. Leaf spot of groundnut is caused by :

 
 
 
 

48. Mixed cropping helps :

 
 
 
 

49. Black rust of wheat is caused by:

 
 
 
 

50. Quarantine regulations are concerned with:

 
 
 
 

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