Download PTU B.Sc-Agriculture 2020 March 2nd Sem 72356 Elementary Microbiology Question Paper

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Roll No. || L] [ 1] [ 1] Total No. of Pages : 02

Total No. of Questions : 09

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B.Sc. (Agriculture) (2014 to 2018) (Sem.-2)

ELEMENTARY MICROBIOLOGY

Subject Code : BSAG-201

M.Code : 72356

Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt ANY FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt ANY TWO questions.

SECTION-A

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1. Write a short note on the following :
   1. Fermentation
   2. Toadstools
   3. Generation time
   4. PGPR’s
   5. Lichens

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   6. Humus
   7. Indicator organisms
   8. Energy parasites
   9. Mesosomes
   10. Food preservation

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SECTION-B

1. Write down some of the applied fields of microbiology and make a general statement of the importance of microorganisms in each field.
2. Draw labeled growth curve of bacteria grown in batch culture. Discuss various phases along with the factors which determine the beginning and end of each phase.
3. What is BNF? Discuss nitrogen cycle in detail with microorganisms involved at each step.

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4. What is biogas? Describe the detailed process of biogas production.
5. What is Glycolysis? Explain its pathway mentioning the enzyme involved along with the ATP’s produced.

SECTION-C

1. What are bacteriophages? Explain different stages of lytic cycle for its multiplication. How does it differ from the lysogenic cycle?
2. What is microbial food spoilage? Explain different types of food spoilage, their causative agents and measures to prevent the spoilage’of food.

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3. What are microbial inoculants? Explain the different types of bioinoculants along with their advantages and constraints.

NOTE : Disclosure of Identity by writing Mobile No. or Marking of passing request on any paper of Answer Sheet will lead to UMC against the Student.