National Open University of Nigeria
14-16 Ahmadu Bello Way, Victoria Island Lagos
School of science and technology
March/April 2014 Examination
COURSE CODE: BIO 405
COURSE TITTLE: HYDROBIOLOGY EXAMINATION
TIME ALLOWED: 2hrs
Instructions: ANSWER ONLY 4 QUESTIONS
1a. define water pollution?
b. what are the causes of water pollution ?
c. outline the negative effects that could arise as a
result of water pollution
d. mention five water-related diseases and their means of
transmission
2. Name the basic types of fresh water ecosystems. Give
examples
b. briefly describe a fresh water ecosystem
c. what are the sources of fresh water
3a. define autotrophic organisms. Give examples
b. define heterotrophic organisms give examples
c. outline the
importance of benthic invertebrates.
d. mention the different communities of benthic organisms
4a. define productivity in ecology
b. distinguish between primary productivity and secondary
productivity
c. in aquatic system primary production is typically
measure using different techniques names
this techniques
d. why are wetlands the most productive natural ecosystem
?
5. outline the general features of kanji lake
b. why is lake Tanganyika an important biological
resources for the study of speciation in evolution
c. mention the five major natural vegetation types of
lake chilwa
6a.outline the role of agriculture in eutrophication
b. what are the symptoms of eutrophication
c. mention the effect of eutrophication on receiving
ecosystem
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you can also attend Online Classes,Online Colleges,online tutorials. to be well prepared for exam Goodluck.
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you can also attend Online Classes,Online Colleges,online tutorials. to be well prepared for exam Goodluck.
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