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Iph2206:Pathology Question Paper

Iph2206:Pathology

Course:Bachelor Of Science In Public Health

Institution: Meru University Of Science And Technology question papers

Exam Year:2012

INSTRUCTIONS: Answer question one and any other two questions
QUESTION ONE (30 MARKS)
a) Explain the three main causes of post harvest losses. (9 Marks)
b) Post harvest diseases are often classified according to how infection is initiated.
Explain this statement. (8 Marks)
c) Explain how fruit ripening stage influences pathogen attack and spoilage. (4 Marks)
d) Briefly explain the influence of temperature on fungal spore germination and spoilage
of vegetables. (4 Marks)
e) List and briefly explain any three requirements for a container meant for packaging
fresh produce. (3 Marks)
f) In post harvest handling of fruits and vegetables, what is ‘field heat’? (2 Marks)
QUESTION TWO (20 MARKS)
Write short notes on;
a) Pathogen penetration following physiological damage of a fruit. (5 Marks)
b) Pathogen penetration following a primary pathogen attack in a fruit. (5 Marks)
c) Influence of pH on microbial attack of fruits and vegetables. (5 Marks)
d) Influence of inoculum level on disease development. (5 Marks)
QUESTION THREE (20 MARKS)
a) Name any five important genera of moulds responsible for postharvest diseases of
fruits. (6 Marks)
2
b) Name any two genera of bacteria that cause soft rot of vegetables and fruits.
(2 Marks)
c) Explain any six defence mechanisms employed by a plant or plant organ in
counteracting a pathogen attack. (12 Marks)
QUESTION FOUR (20 MARKS)
Explain the postharvest disease control and prevention under the following headings;
a) Chemical control. (14 Marks)
b) Prevention of injury. (6 Marks)
QUESTION FIVE (20 MARKS)
Explain what you understand by;
a) Modified atmosphere packaging. (5 Marks)
b) Controlled atmosphere storage. (5 Marks)
c) Explain any five practical advantages of storage of fruits under controlled atmosphere,
(10 Marks)

Iph2206:Pathology Question Paper

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