NATIONAL OPEN UNIVERSITY OF NIGERIA,
91 CADASTRAL ZONES, NNAMDI AZIKIWE EXPRESSWAY, JABI, ABUJA.
FACULTY OF SCIENCES
JULY 2017 EXAMINATION.
COURSE CODE: DAM 462
COURSE TITLE: AGRICULTURAL DATA SYSTEMS
CREDIT UNIT: 2
TIME ALLOWED: 3 HOURS
INSTRUCTION: ANSWER QUESTION 1 (25 MARKS) AND ANY THREE (15 MARKS EACH) QUESTIONS. (TOTAL= 4 QUESTIONS).
1. a.
ii. What is Information Technology? (2 Marks)
iii. List any four (4) important significances of IT in education (2 Marks)
iv. Write short notes on the following:
· Explicit systems (2 Marks)
· Implicit systems (2 Marks)
b.
i. What is A Decision Support System (DSS) (2 Marks)
ii. Highlight the requirements for a high-level decision support system (8 Marks)
c.
i. What is System Modelling (2Marks)
ii. What is the major goal of system modelling? (2 Marks)
iii. List the major divisions/classifications of system modelling (3 Marks)
2. a. In an era where information processing and acquisition costs decline and the use of computer models for farm management decision support is expanding rapidly what are the two main purposes for which models are designed for ? ( 2 Marks)
b. In agriculture systems classification what is the major factor which differentiates order level 1 systems from order level 2 system (3 marks)
c. List and briefly explain the classifications of agricultural systems as outlined by Dillon (1992). (10 Marks)
3. a) What is an agricultural system? (2 Marks)
b) What makes an agricultural system dynamic? (2 Marks)
c) What are the purposes/uses of systems models as stipulated by Schoemaker (1982) (6 Marks)
d) In the context of agriculture, highlight the two classifications/ headlines under which the potential of information technology (IT) can be broadly assessed (2 Marks).
e) The database is perceived by its user as set of facts about objects. These facts are of various types. Highlight them. (3 Marks)
4.
a) How can the need for expert systems for technical information transfer in agriculture be identified? (4 Marks)
b) What is a database model? (1 Marks) List any four Database models (2 Marks)
c) Using a detailed diagram only, illustrate the workflow Decision Support System (DSS) (8 marks)
5. a) Using tables, highlight the differences and similarities between system design method and Object Oriented system design method (10 Marks)
b) Explain the following (5 Marks)
i. Sitemap
ii. Null values
iii. Record r = db.locate (ko)
iv. Database db = new
v. db.delete (ko)
6. a) List the phases in the design process of a Decision Support System. (3 Marks)
b) Illustrate With the a diagram alone, the phases/steps in the design process of a decision support system (10 marks)
c) List any two main conceptual frameworks in system modelling (2 Marks)
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