Question 1:
a) Describe the importance of aero microbiology in relation to the plant pathology.
b) Write a detailed account on the anaerobic treatment of the sewage.
Question 2:
a) Explain the decomposition of the soil organic matter.
b) What are biogeochemical cycles? Illustrate the role of microbes in nitrogen cycle.
Question 3:
a) Explain the various kinds of mycorrhizal and write the significance of VAM fungi.
b) What is biological nitrogen fixation? Write the biochemistry comprised in biological nitrogen fixation.
Question 4:
a) Explain different procedures for the development of disease resistant varieties.
b) Write various symptoms caused by plant pathogenic bacteria.
Question 5: Write short notes on the terms given below:
• Aeroallergens.
• Water - borne pathogens.
• Soil microflora.
• Iron in soil.
• Plant growth promoting rhizobacteria.
• Azospirillum.
• Etiology of blast of rice
• Importance of seed treatment.