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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:2012

QUESTION ONE (30 MARKS)
a) i) Before man there were no pests. TRUE or FALSE. (1 Mark) ii) Justify your answer. (2 Marks) b) briefly describe; i. A typical holometabolous life cycle. (4 Marks) ii. Wing venation in insects. (4 Marks) c) Explain why; i. In praying mantids (Orthoptera) the male continues to copulate even as the female eats his head. (2 Marks) ii. The surroundings where blowflies are feeding on rotting tissue are littered with many dark dots. (2 Marks) d) i) How is the tracheal system adapted for respiration in insects? (3 Marks) ii) How does blood circulation take place in insects? (5 Marks) e) Explain how the following activities have compounded the pest situation today. (3 Marks) i. Monocrops ii. High yielding varieties iii. International transport. f) Define the terms; (4 Marks) i. Economic Injury Level ii. Integrated Pest Management
QUESTION TWO (20 MARKS)
a) Discuss the generalized mouthparts of insects. (10 Marks)
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b) Using a suitable modified arrangement, show functional deviation from the primitive type above. (10 Marks)
QUESTION THREE (20 MARKS)
a) You have been appointed pest manager at a large commercial farm, Nchiru Growers. How would you carry out sampling from vegetation in and around your farm? (10 Marks) b) What are the factors responsible for insects evolutionary success? (10 Marks)
QUESTION FOUR (20 MARKS)
a) List down the characteristics of the class Insecta. (5 Marks) b) Discuss the characteristics of any three Orders in the class Insecta. (10 Marks) c) Reproductive characters are of great importance in insect taxonomy. Briefly describe the common asexual reproduction characters. (5 Marks)
QUESTION FIVE (20 MARKS)
a) Using appropriate examples, highlight on the following feeding habits of insects (4 Marks) i. Phytophagy ii. Zoophagy b) With the aid of a diagram, describe in details the digestive system of a typical insect. (10 Marks) c) Discuss food utilization mechanisms in insects. (6 Marks)

Szl2110:Entomology Question Paper

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