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NATIONAL OPEN UNIVERSITY OF NIGERIA
UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
OCTOBER/NOVEMBER 2019 EXAMINATION
COURSE TITLE: SOIL ECOLOGY
COURSE CODE: BIO 408
TIME ALLOWED: 2 HOURS
CREDIT UNIT: 2 CREDIT UNITS
INSTRUCTION: ANSWER QUESTION 1 AND ANY OTHER THREE QUESTIONS
1. (a). Discuss the cation exchange capacity of soil (13 marks)
(b). In the table below, provide the dominant mineral and sedimentary associated with the metamorphic rocks that were specified.
Dominant mineral
Sedimentary rock
Metamorphic rock
Calcite (CaCo3)
Dolomite (CaCO3MGCO3)
Quartz (Si02)
Clays
Gneiss
Schist
12 marks
2. (a.) i. What are the basic types of biogeochemical cycles? (2 marks)
(a.) ii. State the characteristics of biogeochemical cycles. (4 marks)
(b). What are the benefits of soil organisms? (9 marks)
3. What are the factors that limit nutrients in the soil? Discuss them. (15 marks)
4. (a). Briefly Discuss three main sources of soil nutrients. (11 marks)
(b). Compacting a soil would likely reduce the amount of water available to growing plants. Give four reasons for this. (4 marks)
5. (a). With a good schematic diagram, discuss the nitrogen cycle (12 marks)
(b). Why is soil taxonomy said to be a hierarchical classification system? (3 marks)
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