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 304
COURSE TITLE: GENERAL ECOLOGY
TIME ALLOWED: 2 HOURS
INSTRUCTION: ANSWER ANY FOUR QUESTIONS
1ai. Why is it important to sustain the earth’s biodiversity?
ii. b. Describe the components of a human population pyramid.
b. Write shorts note on the following:
i. Territories ii. Population lifetables iii.Denitrification
2ai. Define the term ecosystem.
ii. List the components of an ecosystem giving two examples of each
b. Write short notes on the following:
(i) Nitrogen fixation (ii) Food Chain (iii) Pyramid of numbers (iv) Community
3ai. What is biogeochemical cycle?
ii. Photosynthetic plants are of gross importance in the ecosystem. Discuss.
bi. What do you understand by global warming?
ii. How is global warming affected by industrialization?
iii. What are the harmful effects of decreasing the earth’s ozone layer?
4ai.What do you understand by ecological succession?
ii. Humans are considered to be initiators of secondary succession. Discuss.
b. Distinguish between the following:
(i) a habitat and a niche (ii) autotrophs and heterotrophs
(iii) gross primary productivity and net primary productivity
(iv) Density-dependent and density-independent factors of population regulation
5ai. Describe three attributes of populations.
ii. Explain the role played by some species of bacteria and leguminous plants in nitrogen
fixation.
bi. List some special adaptations desert plants and animals have developed.
ii.What are the major factors that influence the formation of terrestrial biomes?
6ai. How is acid rain formed?
ii. Enumerate the damages caused by acid rain.
bi. What are the primary reservoirs for the chemicals in the biogeochemical cycles?
ii. With the aid of a well labeled illustration, describe the carbon cycle.
For the 2015 – till date past questions for this course CLICK HERE
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