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National Open University Exam Past Question – BIO 405 OCTOBER/NOVEMBER 2014 EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA BIO 405 HYDROBIOLOGY

14-16 AHMADU BELLO WAY, VICTORIA ISLAND LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY OCTOBER/NOVEMBER 2014 EXAMINATION

 

COURSE CODE: BIO 405

 

COURSE TITLE: HYDROBIOLOGY TIME ALLOWED: 2HOURS

INTRUCTION: ANSWER QUESTION 1 (COMPULSORY) AND ANY OTHER THREE QUESTIONS.

 

 

 

 

  1. a. Outline the role of agriculture in eutrophication. (3marks). b. Identify any SIX (6) symptoms of eutrophication? (12marks).
  2. c. State ANY FIVE (5) effects of eutrophication on the receiving ecosyste (10marks)

 

 

 

 

  1. a. Name the THREE (3) basic types of freshwater ecosystems. Give TWO (2) examples each. (11marks).
  2. Give a precise description of a freshwater ecosystem. 10marks c. Name any TWO (2) sources of freshwater? 4marks.

 

 

  1. a. Define autotrophic organisms. Give any TWO (2) examples. (4marks)
  2. Define heterotrophic organisms. Give any TWO (2) examples. (4marks)
  3. c. Outline FOUR (4) importance of benthic invertebra (8marks).
  4. Describe the diversity of benthic organisms in different communities. (9marks).

 

  1. a. Define Productivity in ecology. (3marks).

 

 

  1. Distinguish between primary and secondary productivity in ecology. (6marks).
  2. c. In  aquatic  systems,  primary  production  is  typically  measured  using  different tec Enumerate FOUR (4) of these techniques. (12marks).
  3. Why are wetlands the most productive natural ecosystems? (4marks).
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  1. a. Outline the general features of Kainji Lake. (10marks).

 

  1. Why is Lake Tangayinka an important biological resource for the study of speciation in evolution? (10marks).

 

  1. c. Mention the five major natural vegetation types of Lake Chilwa. (5marks).

 

  1. a. Define water pollution? (2marks).

 

  1. State any THREE (3) causes of water pollution? (3marks).

 

  1. c. Outline the negative effects that could arise as a result of water pollution.(10marks). State FIVE (5) water-related diseases and their means of transmission. (10marks).

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