NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY/FEBRUARY 2018 EXAMINATION

COURSE CODE: BIO 405 (2 CREDIT UNITS) TIME ALLOWED: 2HOURS

COURSE TITLE: HYDROBIOLOGY

INSTRUCTION: ANSWER QUESTION ONE (1) AND ANY OTHER THREE (3) QUESTIONS ONLY

1a        Enumerate and any six Effects of Water Pollution on the ecosystem (6marks)

1b        List and explain any four major causes of Eutrophication (12 marks)

1c        Give a general overview of Benthic Invertebrates    (7Marks)

2a        Outline any five symptoms  of eutrophication (5marks)

2b        List any four problems of eutrophication on human societies in Nigeria (4marks)

2c        List and define the three types of Freshwater ecosystem (6marks)

3a        Briefly explain how to determine each the following water quality parameters

i           pH of Water Samples (2marks)

ii          Water Current (2marks)

iii         Total Suspended Solid (2marks)

3b        What is a fresh water ecosystem? (5marks)

3c        How would you determine the major zones in a river ecosystem? (4marks)

4a        List the four main techniques for the determination of primary production in an     aquatic system (4marks)

4b        List the abiotic characteristics of a freshwater ecosystem (5marks)

4c        Outline and describe briefly any 6 major natural vegetation types of the Lake         Chilwa wetland (6Marks)

5a        What are the major causes of diarrhoea (6marks)

5b        Outline the Key measures to reduce the number of cases of diarrhoea (5marks)

5c        Define any two of the following freshwater habitats (4marks)

i           Montane Freshwaters  (2marks)

ii          Xeric Freshwaters and Endorheic (Closed) Basins  (2marks)

iii         Temperate Coastal Rivers  (2marks)p