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Biology 1999 JAMB Past Questions

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16

Mammals acclimatize to reduced oxygen content at high altitudes by

  • A. the stimulation of marrow to reduce the amount of erythrocytes produced
  • B. increasing the rate at which erythrocytes are destroyed
  • C. the stimulation of marrow to produce more erythrocytes
  • D. increasing the break down of the protein portion of the erythrocytes
View Answer & Discuss (31) JAMB 1999
17
The modes of nutrition in Nitrobacter, Ascaris and Homo sapiens respectively are
  • A. photosynthetic , parasitic and holozoic
  • B. chemosynthetic, parasitic and holozoic
  • C. photosynthetic, parasitic and heterophytic
  • D. chemosynthetic, holophytic and holozoic
View Answer & Discuss (7) JAMB 1999
18
The richest source of vitamin A are
  • A. palm oil and groundnut oil
  • B. palm oil and carrot
  • C. rice and groundnut oil
  • D. oranges and carrot
View Answer & Discuss (11) JAMB 1999
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19
The force that holds water together in the form of a stream within the xylem tube is the
  • A. cohesion of water molecules to one another by hydrogen bonds
  • B. force of gravity attacking the water molecules through the hydrogen bonds
  • C. attraction between the water and xylem osmotic force
  • D. normal flow of water from the ground with help of gravitational force
View Answer & Discuss (8) JAMB 1999
20
Yellowing of leaves is a symptom associated with deficiency of
  • A. iron, calcium and magnesium
  • B. nitrogen, sulphur and potassium
  • C. sulphur, phosphorus and iron
  • D. magnesium, nitrogen and iron
View Answer & Discuss (2) JAMB 1999
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