Quiz_Plant_Pathogen

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1. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

7. Citrus canker is caused by :

 
 
 
 

8. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

15. Etiology includes the study of :

 
 
 
 

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

 
 
 
 

17. Pythium debaryanum is the causative agent of:

 
 
 
 

18. Smut of maize is caused by :

 
 
 
 

19. The disease symptom necrosis refers to :

 
 
 
 

20. Disease resistant plant varieties can be produced by :

 
 
 
 

21. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

23. Black rust of wheat is caused by:

 
 
 
 

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

 
 
 
 

25. Downy mildew disease is caused by :

 
 
 
 

26. Leaf spot of groundnut is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

35. Chief constituents of bordeaux mixture are :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

38. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

40. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

42. Red rot of sugarcane is caused by :

 
 
 
 

43. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

45. Quarantine regulations are concerned with:

 
 
 
 

46. Mixed cropping helps :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

49. Banana bunchy top is caused by :

 
 
 
 

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

 
 
 
 

51. Late blight of potato is caused by :

 
 
 
 


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