NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JULY 2017 EXAMINATION

COURSE CODE: BIO 414                                                                         

COURSE TITLE: APPLIED ENTOMOLOGY (2 CREDIT UNITS)

TIME ALLOWED: 2HOURS

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

1.  a. Explain what is meant by a pest, chemical pest control and pesticides (3marks)

    b. Enumerate ten ideal qualities of an insecticide (5marks)

   c. Based on organisms or pest organisms against which the compounds are used, mention  four  different types of pesticides (2marks)

d. Give a concise classification of insects based on their economic importance. Mention at least one example in each classification (5marks)

e. Honey bee is known to be a very good example of an economic insect. Briefly describe its life Cycle (10marks)

2. a. Mention ten parasitic mites of mammals (10marks)

    b. Enumerate five mites of named invertebrate organisms (5marks)

3. a. The classification of an insect as a pest is a subjective one, based on its potential damage to human purposes. Explain (8marks).

    b. State four reasons why some insects are considered as pest? (4marks).

    c. Mention three insects that are considered as pests (3marks).

4. a. What are the important advancements reckoned with in the study of insecticide metabolism?  (6marks)

    b. Briefly explain the properties of pesticides which determine their behavior and fate  (4marks)

    c. Explain how Pesticides enters into the atmosphere (5marks)

5. a. Give examples of predator-prey and host-parasitoid relationships amongst insects (5marks)

    b. Mention the specific orders of insects that are involved in these relationships (5marks)

    c.  Explain the techniques used by insect as predators and parasitoids  (5marks)