Quiz_Plant_Pathogens

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

 
 
 
 

2. Black rust of wheat is caused by:

 
 
 
 

3. Quarantine regulations are concerned with:

 
 
 
 

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

 
 
 
 

5. Mixed cropping helps :

 
 
 
 

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

 
 
 
 

7. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

9. Red rot of sugarcane is caused by :

 
 
 
 

10. Pythium debaryanum is the causative agent of:

 
 
 
 

11. Etiology includes the study of :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

19. Downy mildew disease is caused by :

 
 
 
 

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

 
 
 
 

21. Citrus canker is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

25. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

28. Disease resistant plant varieties can be produced by :

 
 
 
 

29. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

35. Smut of maize is caused by :

 
 
 
 

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

 
 
 
 

37. Aflatoxin is produced as a product in :

 
 
 
 

38. The disease symptom necrosis refers to :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

41. Chief constituents of bordeaux mixture are :

 
 
 
 

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

 
 
 
 

43. Leaf spot of groundnut is caused by :

 
 
 
 

44. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

47. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

51. Banana bunchy top is caused by :