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Biology WAEC Past Questions

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221
Which of the following effects would desertification have on the
ecological balance represented in the diagram above? The calorific
value' of the energy
  • A. . 10 x 104k cal obtained from the sun would decrease
  • B. 10 x 104k cal obtained from the sun would increase
  • C. 6 x 104k cal obtained at level I would increase
  • D. 1 x 104k cal obtained at level V would increase
  • E. 3.5x 104k cal obtained at level II would increase
View Answer & Discuss (7) WAEC 1989
222
One of the methods of preventing measles is by
  • A. sleeping under mosquito net
  • B. attacking the vectors
  • C. attacking the secondary host
  • D. vaccinating young children
  • E. providing clean water supply
View Answer & Discuss WAEC 1989
223
Group instinct or social behaviour is not displayed in
  • A. soldier ants
  • B. bees
  • C. chickens
  • D. weaver birds
  • E. termites
View Answer & Discuss (6) WAEC 1989
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224
Which of the following fixes atmospheric nitrogen?
  • A. Rhizobium
  • B. Nitrosomonas
  • C. Nitrobacter
  • D. Putrefying bacteria
  • E. Denitrifying bacteria
View Answer & Discuss (3) WAEC 1989
225
The spaces between neutrones through which impulses cross by means of chemical reaction are called
  • A. axons
  • B. ganglia
  • C. synapses
  • D. dendrites
  • E. pia mater
View Answer & Discuss WAEC 1989
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