Quiz_Plant_Pathogens

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

5. Black rust of wheat is caused by:

 
 
 
 

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

 
 
 
 

7. Citrus canker is caused by :

 
 
 
 

8. Red rot of sugarcane is caused by :

 
 
 
 

9. The disease symptom necrosis refers to :

 
 
 
 

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

 
 
 
 

11. Leaf spot of groundnut is caused by :

 
 
 
 

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

 
 
 
 

13. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

15. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

19. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

21. Quarantine regulations are concerned with:

 
 
 
 

22. Pythium debaryanum is the causative agent of:

 
 
 
 

23. Chief constituents of bordeaux mixture are :

 
 
 
 

24. Disease resistant plant varieties can be produced by :

 
 
 
 

25. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

29. Banana bunchy top is caused by :

 
 
 
 

30. Downy mildew disease is caused by :

 
 
 
 

31. Mixed cropping helps :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

35. Smut of maize is caused by :

 
 
 
 

36. Etiology includes the study of :

 
 
 
 

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

 
 
 
 

38. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

41. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

44. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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