Quiz_Plant_Pathogens

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

 
 
 
 

2. Quarantine regulations are concerned with:

 
 
 
 

3. Small epidermal swellings due to infection are called :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

7. Ergot is obtained from :

 
 
 
 

8. Red rot of sugarcane is caused by :

 
 
 
 

9. Black rust of wheat is caused by:

 
 
 
 

10. Mixed cropping helps :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

13. The disease symptom necrosis refers to :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

16. Pythium debaryanum is the causative agent of:

 
 
 
 

17. Downy mildew disease is caused by :

 
 
 
 

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

 
 
 
 

19. Which of the following statements is not correct?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

22. Disease resistant plant varieties can be produced by :

 
 
 
 

23. Citrus canker is caused by :

 
 
 
 

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

 
 
 
 

25. Banana bunchy top is caused by :

 
 
 
 

26. Smut of maize is caused by :

 
 
 
 

27. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

28. Etiology includes the study of :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

33. Aflatoxin is produced as a product in :

 
 
 
 

34. Chief constituents of bordeaux mixture are :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

37. Leaf spot of groundnut is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

42. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

48. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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