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Friday, 13 November 2026
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Biology Past Questions and Answers

Jamb 1990 Biology Questions

Question 41:
Which set of disease is spread mainly by insect vectors?
  • A Cholera, tenia and gonorrhoea
  • B Poliomyelitis, tuberculosis and syphilis
  • C Cholera, malaria and tuberculosis
  • D Malaria, cholera and river blindness
View Answer & Explanation
Question 42:
Which of the following constitute pollution?
  • A Droppings from birds
  • B Loud disco sound
  • C A pack of cigarettes
  • D Refuse in an incinerator
View Answer & Explanation
Question 43:
An acidic soil can be improved upon by
  • A Sedimentation
  • B Leaching
  • C Flocculation
  • D Watering
View Answer & Explanation
Question 44:
What do bacteria in root nodules derive from the host plant?
  • A Protection and minerals
  • B Water and minerals
  • C Carbonhydrates and water
  • D Protection and carbohydrates
View Answer & Explanation
Question 45:
Free nitrogen is released to the atmosphere by
  • A Nitrogen-fixing bacteria
  • B Nitrifying bacteria
  • C Denitrifying bacteria
  • D Saprophytic bacteria
View Answer & Explanation