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121
If a baby is a female, her mother's ovum must have been fertilized by a sperm carry the chromosome
  • A. X
  • B. XY
  • C. XX
  • D. YY
  • E. Y
View Answer & Discuss (18) JAMB 1980
122
Leguminous plants, e.g Mucana, are usually planted in cultivated farmlands because they
  • A. enrich the soil with phoshates
  • B. provide animals with food
  • C. enrich the soil with organic nitrogen
  • D. protect the soil from being over-heated
  • E. protect the micro organisms in the soil
View Answer & Discuss (1) JAMB 1980
123
During thunderstorms the energy of lightning discharge causes
  • A. oxygen and nitrogen to combine
  • B. more carbon dioxide to be formed
  • C. nitrites to be converted to nitrates
  • D. nitrates to be converted to nitrogen
  • E. death
View Answer & Discuss (6) JAMB 1980
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124
A few grams of dried soil were first heated until red hot and then further heated until no more smoke was released. This experiment was to determine
  • A. amount of water in soil
  • B. percentage of water in soil
  • C. presence of humus in soil
  • D. resistance of laterities to heat
  • E. release of smoke from the soil
View Answer & Discuss (11) JAMB 1980
125
Oxygen from the atmosphere reaches the mammalian blood stream through one of the path indicated below. Indicate the correct path, a = mouth, b = trachea, c = bronchiole, d = nostril, e = bronchus, f = alveoli
  • A. a → b → e → f → d
  • B. b → d → f → e → c
  • C. d → b → e → c → f
  • D. b → a → f → e → c
  • E. f → e → c → d → c
View Answer & Discuss (5) JAMB 1980
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
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