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. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

5. Downy mildew disease is caused by :

 
 
 
 

6. Leaf spot of groundnut is caused by :

 
 
 
 

7. Citrus canker is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

10. Smut of maize is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

13. Black rust of wheat is caused by:

 
 
 
 

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

 
 
 
 

15. The disease symptom necrosis refers to :

 
 
 
 

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

 
 
 
 

17. Banana bunchy top is caused by :

 
 
 
 

18. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

23. Chief constituents of bordeaux mixture are :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

26. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

28. Red rot of sugarcane is caused by :

 
 
 
 

29. Pythium debaryanum is the causative agent of:

 
 
 
 

30. Disease resistant plant varieties can be produced by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

33. Etiology includes the study of :

 
 
 
 

34. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

36. Red rot of sugarcane is caused by :

 
 
 
 

37. Ergot is obtained from :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

42. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

46. Mixed cropping helps :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

49. Quarantine regulations are concerned with:

 
 
 
 

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

 
 
 
 

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