Sbt2414:Principles Of Plant Pathology Question Paper
Sbt2414:Principles Of Plant Pathology
Course:Bachelor Of Crop Protection
Institution: Meru University Of Science And Technology question papers
Exam Year:2013
QUESTION ONE – 30 MARKS
(a) Define the following terms (i) Induced resistance (ii) Necrosis (iii) Biotrophs (iv) Virulence (v) R genes (b) Briefly describe how pathogens interfere with translocation of water in plants. (5Marks) (c) Using a schematic diagram, describe the life cycle of root-knots nematodes. (5Marks) (d) By use of the ‘zigzag’ model, describe the evolution of plant defence mechanisms against pathogens. (10Marks) (e) State five characteristics of diseases caused by mycoplasma-like organisms (5Marks)
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QUESTION TWO – 20 MARKS
In every infectious disease, there are distinct events that occur leading to disease development. Discuss in detail the plant disease cycle. (20Marks)
QUESTION THREE – 20 MARKS
(a) Assume that you have been given a leaf infected by a fungus, discuss how you would isolate and identify the pathogen upto the genus level. (15Marks) (b) State five objectives of the Kenya Plant Health Service (KEPHIS) (5Marks)
QUESTION FOUR – 20 MARKS
(a) Discuss Late Blight of potato caused by phytophthora infestans in terms of symptoms, disease development and control strategies. (15Marks) (b) Briefly expain how moisture influences disease development in plants. (5Marks)
QUESTION FIVE – 20 MARKS
Discuss mechanisms of transmission of plant pathogenic viruses from one plant to another.
(20Marks)
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