Quiz_Plant_Pathogens

1. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

4. Banana bunchy top is caused by :

 
 
 
 

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

 
 
 
 

6. Mixed cropping helps :

 
 
 
 

7. The disease symptom necrosis refers to :

 
 
 
 

8. Small epidermal swellings due to infection are called :

 
 
 
 

9. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

17. Leaf spot of groundnut is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

20. Smut of maize is caused by :

 
 
 
 

21. Pythium debaryanum is the causative agent of:

 
 
 
 

22. Chief constituents of bordeaux mixture are :

 
 
 
 

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

 
 
 
 

24. Citrus canker is caused by :

 
 
 
 

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

 
 
 
 

26. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

30. Black rust of wheat is caused by:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

33. Downy mildew disease is caused by :

 
 
 
 

34. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

37. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

40. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

46. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

48. Disease resistant plant varieties can be produced by :

 
 
 
 

49. Etiology includes the study of :

 
 
 
 

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

 
 
 
 

51. Quarantine regulations are concerned with: