YABA COLLEGE OF TECHNOLOGY
SCHOOL OF SCIENCE
DEPARTMENT OF BIOLOGICAL SCIENCE
2 SEMESTER EXAMINATIONS 2017/2018 SESSION
CLASS: ND II (PT) SCIENCE LAB. TECH.
COURSE TITLE: ECOLOGY
PAPER CODE: STB222
COURSE UNIT 2
INSTRUCTION There shoule be ne joywriing or ary other cripton on y estion paper, capt name and re tion number where necessary
MOBILE
PHONE, MORILE DEVICE AND BAGS ARE PROHIBITED IN THE EXAMINATION HALL. ATMPTA OUT OF &QUESTIONS
Question 1
a. Define population size
b. Explain briefly any 2 of the following simpling methods used in population study (1) Transect (ii) Lincoln Index (iii) Quadrant
c. List 3 common environmental pollutants with their sources
d. Give 4 major causes of gully erosion
e. Explain in simple terms (including 2 consequences) of any one (1) of the following
(1) Global warming (ii) Ozone layer depletion
Question 2
a. Classify soil arganisms into broad groups and give 2 examples each
b. Outline 2 effects cach for the following abiotic components on soil
(i) Soil temperature
(ii) Organic matter
(iii) Soil pH
c. Explain in brief the term nutrient cycling
d.Itemize the 3 basic treatment methods for municipal waste water
Question 3
a. Define a Habitat
b. List and explain the different kinds of habitat
c. Classify aquatic habitat based on salinity content.
d. Describe Lentic and Lotic freshwater bodies
Question 4
a. Explain the difference between Primary Succession and Secondary Succession
b.Outline the 4 factors each that give rise to primary and secondary succession
c. State the adaptive features of some animals in fresh water habitat
Questions 5
a. Explain 5 factors which may affect the population of organisms in a given habitat
b. Describe the five phases of population growth curve.
c. Give an example of a food chain,
Question 6
a. Define ecosystem
b. Explain the biotic components of ecosysiem
c. Highlight 7 major threats to marine systems from human activities
d. List the three kinds of consumers