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721
Soil fertility can be conserved and renewed by
  • A. yearly monocropping
  • B. crop rotation and cover crops
  • C. bush burning to remove unwanted debris
  • D. avoiding artificial manures
View Answer & Discuss (3) JAMB 1993
722

What ecological condition favours the breeding of black flies?

  • A. Fresh water habitat
  • B. Water in ponds and swamp
  • C. Water in small containers
  • D. Fast flowing streams
View Answer & Discuss (11) JAMB 1993
723
Carbon monoxide poisons tissue by
  • A. constricting the blood vessels
  • B. killing the cells
  • C. combining with haemoglobin
  • D. rupturing the blood vessels
View Answer & Discuss (6) JAMB 1993
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724
Which of the following is an example of discontinuous variation observed in man?
  • A. Skin colours
  • B. Tongue rolling
  • C. Body weight
  • D. Height
View Answer & Discuss (3) JAMB 1993
725

During blood transfusion, agglutination may occur when

  • A. contrasting antigens reacts with contrasting antibodies
  • B. similar antigens react with similar antibodies
  • C. two different antigens react with each other
  • D. two different antibodies react with each other
View Answer & Discuss (13) JAMB 1993
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