M.Sc-M.Sc Botany 2nd Year Paper - VI : MICROBIOLOGY, MYCOLOGY AND PLANT DISEASES (Acharya Nagarjuna University - Center for Distance Education, Guntur, Andhra Pradesh-2013)

(DBOT 22) 
M.Sc. (Final) DEGREE EXAMINATION, MAY - 2013 
Second Year 
Botany 
Paper - VI : MICROBIOLOGY, MYCOLOGY AND PLANT DISEASES 

Time : 03 Hours                                                                            Maximum Marks : 100

 Section - A (5 × 8 = 40) 

Answer any Five questions 

1) Photosynthetic bacteria. 
2) Nematodal viral transmission. 
3) Fungal engymes. 
4) Non thalloid fungi. 
5) Phytoalexins. 
6) Dispreral of plant pathogens. 
7) TMV. 
8) Powdery mildew. 
Section - B (4 × 15 = 60) 
Answer All questions 9) a) Classify the bacteria based on its nutritional types. 
OR 
b) Define vector? Explain the mode of transmission of plant viruses. 
10) a) Mention the general characteristics of ascomycotina and describe the production of 
ascospores. 
OR 
b) Elaborate on the industrial applications of fungi. 
11) a) Write an account on plant disease index and disease forecast. 
OR 
b) Describe the morphological and physiological changes in diseased plants. 
12) a) What are Bio-Pesticides, explain the biological control of plant pathogens. 
OR 
b) Explain the symptoms, epidemiology and control of Blast disease of rice. 
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