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Szl2110:Entomology Question Paper

Szl2110:Entomology

Course:Bachelor Of Horticulture

Institution: Meru University Of Science And Technology question papers

Exam Year:2011

QUESTION ONE (30 MARKS)
a. Compare and contrast the following paired terms (10 Marks) i. Holometabolous;hemimetabolous life cycle ii. Polypneustic;oligopneustic spiracles iii. Raptorialcursorial leg iv. Monitoring; scouting v. Arrhenotoky;thelytoky b. Explain any five factors responsible for insects success on earth (5 marks) c. Describe the morphology of the following: i. Halters ii. Tegmina iii. Elytra (3 Marks) d. Explain why; i) When one cuts an earthworm, it continues wriggling for a considerable duration of time (2 Marks)
ii) Blood circulation is sluggish in insects (2 Marks)
e. Describe any TWO stridulating mechanisms in insects with examples (2 Marks) f. Give any THREE characteristics unique to the order Diptera (3 Marks)
g. Place the following insects in their respective orders (3 Marks)
i. Aphid ,Aphis gossypii ii. Armyworm, Spodoptera exempta iii. Cockroach, Blatella germanica
2
QUESTION TWO (20 MARKS)
a. Discuss man’s role in the deteriorating insect pest situation today (8 Marks) b. All insects are pests. Discuss. (12 Marks)
QUESTION THREE (20 MARKS)
a. Define the following thresholds: i. economic injury level (2 Marks) ii. action threshold (2 marks) b. Categorize the types of damages caused by insects (8 Marks) c. Write short notes on the following pest control strategies (8 Marks) i. Biological ii. Cultural iii. Chemical iv. Physical
QUESTION FOUR (20 MARKS)
a. Explain the mechanisms of food utilization in insects (6 Marks) b. Describe the haustellate type of modification of mouth parts (6 Marks) c. Discuss the digestive system of a typical insect (8 Marks)

Szl2110:Entomology Question Paper

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