NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
APRIL 2019 EXAMINATION

COURSE CODE: BIO 407

COURSE TITLE: BASIC ENTOMOLOGY (2 CREDIT UNITS)

TIME ALLOWED: 2HOURS

INTRUCTION: QUESTION ONE IS COMPULSORY AND ANY OTHER THREE QUESTIONS.     

1. a. Enumerate ten characteristics of insects (5marks)

b. State five beneficial and detrimental effects of insects (5 marks)

c. Outline five factors that contributes to the success of insects (5marks)

e. Briefly describe the evolution of insects (5marks)

f. What is Tagmatization in insects? (5marks)

2. a. The foregut of the digestive system of insects is divided into four regions:

i. Name these four regions (4 marks)

ii. State one characteristic feature/function of each of these regions (4marks)

b. Mention the three divisions of the Visceral Central Nervous system of insects (3marks)

c. State one function each of these divisions of the Visceral Central Nervous system of insects (3marks)

d. The trachea system of insects is divided into two on the basis of spiracles. Mention these two systems (1mark).

3. a The class Apterygota is classified as one the most primitive class of insects because they possess certain characteristics. State these characteristics (3marks).

b. Outline five characteristics of the Proturans (5marks)

c. Cockroaches belong to the group of insects called Dictyoptera. List five characteristics of this group (5marks)

d. State any four economic importance of flies (2marks).

4. a. Describe the mouth part of insects (5marks).

b. i. Mention two basic types of mouth parts found in insects (2marks).

    ii. State one function each of these mouth parts found in insects? (2marks)

c. State the two functions of Maxilla in insects (2marks)

d. The legs of insects consist of six segments. List any four of these segments (4marks)

5. a. i. Define moulting in insect (2 mark)

ii. Describe the process of moulting in insects (13 marks)