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1666
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
1667
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
1668

The activities of an organism which affect the survival of another organism in a habitat can be described as

  • A. biotic factors
  • B. climatic factors
  • C. physiographic factors
  • D. edaphic factors
  • E. abiotic factors
View Answer & Discuss (2) WAEC 1989
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1669
Which of the following. groups of organisms feeds directly on green plants?
  • A. Producer
  • B. Decomposer
  • C. Primary consumer
  • D. Secondary consumer
  • E. Tertiary consumer
View Answer & Discuss WAEC 1989
1670
Which of the following methods is used in food preservation for a long period?
  • A. adding oil to food
  • B. Exposing food to fresh air
  • C. keeping the food in a store
  • D. Warming the food daily
  • E. Salting and drying the food
View Answer & Discuss WAEC 1989
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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