Quiz_Plant_Pathogens

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

7. Downy mildew disease is caused by :

 
 
 
 

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

 
 
 
 

9. Smut of maize is caused by :

 
 
 
 

10. Citrus canker is caused by :

 
 
 
 

11. Red rot of sugarcane is caused by :

 
 
 
 

12. Aflatoxin is produced as a product in :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

16. Late blight of potato is caused by :

 
 
 
 

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

 
 
 
 

18. Red rot of sugarcane is caused by :

 
 
 
 

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

 
 
 
 

20. Black rust of wheat is caused by:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

24. Chief constituents of bordeaux mixture are :

 
 
 
 

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

 
 
 
 

26. Helminthosporium oryzae was the cause of disaster :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

29. Which of the following statements is not correct?

 
 
 
 

30. Mixed cropping helps :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

34. Ergot is obtained from :

 
 
 
 

35. The disease symptom necrosis refers to :

 
 
 
 

36. Banana bunchy top is caused by :

 
 
 
 

37. Small epidermal swellings due to infection are called :

 
 
 
 

38. Disease resistant plant varieties can be produced by :

 
 
 
 

39. Pythium debaryanum is the causative agent of:

 
 
 
 

40. Leaf spot of groundnut is caused by :

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

45. Quarantine regulations are concerned with:

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

49. Etiology includes the study of :

 
 
 
 

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

 
 
 
 

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