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NATIONAL OPEN UNIVERSITY OF NIGERIA
UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
APRIL/MAY 2019 EXAMINATION
COURSE CODE: BIO 405: (2 CREDIT UNITS)
TIME ALLOWED: 2HOURS
COURSE TITLE: HYDROBIOLOGY
INSTRUCTION: ANSWER QUESTION ONE AND ANY OTHER THREE QUESTIONS.
1a Enumerate the effects of water pollution on the ecosystem (10marks)
1b Why are benthic invertebrate communities regarded as prime indicators of environmental conditions? (8marks)
1c Outline the common symptoms and impacts of eutrophication (7marks)
2a List any five problems of eutrophication on human societies in Nigeria (5marks)
2b List any abiotic characteristics of a freshwater ecosystem (5marks)
2c Briefly itemise how to determine the major zones in a river ecosystem (5marks)
3a List any four techniques for the measurement of primary production in aquatic ecosystem (4marks)
3b Give a general overview of Benthic Invertebrates (11 marks)
4a Outline and describe briefly any 6 major natural vegetation types of the Lake Chilwa wetland (12 marks)
4b List the three types of Freshwater ecosystem (3 marks)
5a Describe how to enumerate sediments of microfauna (7 marks)
5b Define, with examples any two of the following freshwater habitats (8 marks)
i Montane Freshwaters
ii Xeric Freshwaters and Endorheic (Closed) Basins
iii Temperate Coastal Rivers
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