Download PTU B.Sc-Agriculture 2020 March 3rd Sem 72556 Principle Of Plant Pathology Question Paper

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Roll No. EEEEEEEE [ ] Total No. of Pages : 02
Total No. of Questions : 09
B.Sc.(Agriculture) (2014 to 2018) (Sem.-3)
PRINCIPLE OF PLANT PATHOLOGY

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INSTRUCTIONS TO CANDIDATES :

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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

1. Write briefly :
   1. Eradicant and Protectant

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   2. Powdery mildew and Downy mildew
   3. Sporangia and Conidia
   4. Inoculum and Inoculum-potential
   5. Antibody and Antigen
   6. Monocyclic and Polycyclic disease

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   7. Pathogenesis and Pathogenecity
   8. Enzymes and Toxins
   9. Blotch and Blight
   10. Facultative parasite and Obligate parasite

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SECTION-B

2. What is fungi? How it reproduce asexually?
3. Write general characteristic of the following genera.
   1. Pestalotia
   2. Anguina

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4. Write general characteristics of Pythium and illustrate its life cycle with suitable diagramme.
5. How will you differentiate Mucor from Rhizopus? Explain with suitable diagramme.
6. Explain the role of biological control in managing plant diseases.

SECTION-C

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7. Differentiate between selective as well as non-selective toxins. How toxins affect the plant tissues? Explain in detail with suitable examples.
8. What is latent infection? Explain by-citing example. What are the important factors influencing infection process?
9. Write down brief note on Phytophthora, Colletotrichum, Pseudomonas and Meloidogyne.

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

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