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201
An association between living organisms in which one lives on and feeds at the expense of the other
organism is known as
  • A. parasitism
  • B. commensalism
  • C. mutualism
  • D. symbiosis
  • E. predation
View Answer & Discuss WAEC 1989
202
Which of the following statements is not correct about food chains?
  • A. All food chains start with a green plant
  • B. Food chains involve feeding relationships among organisms
  • C. horter food chains indicate more effective utilization of energy than longer ones
  • D. There is no energy loss in a food chain
  • E. All food chains have primary consumers.
View Answer & Discuss (3) WAEC 1989
203
Which of the following characteristics is associated with commensalism?
  • A. Both organisms are harmful to each other
  • B. The association involves many organisms
  • C. The association is beneficial to one of the organisms
  • D. Both species are beneficial to each other
  • E. This relationship is found only among higher plants
View Answer & Discuss WAEC 1989
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204
Which of the following statements is not correct about the ecological effects of agricultural activities?
  • A. The use of herbicides and pesticides in farms can cause pollution
  • B. Bush-burning encourages desertification
  • C. Excessive use of fertilizers in farms may have harmful effects
  • D. Tillage of tropical soils with ploughs and harrows may encourage erosion
  • E. Monocropping is one of the cultural methods of controlling pests.
View Answer & Discuss (2) WAEC 1989
205
Pests can be controlled without the subsequent danger of polluting the ecosystem by
  • A. introducing a population of species similar to that of the pest
  • B. increasing the population of the natural enemies of the pest
  • C. eliminating the natural enemies of the pest
  • D. keeping the population of natural enemies of the pest constant
  • E. spraying the ecosystem with pesticide
View Answer & Discuss WAEC 1989
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