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Friday, 06 November 2026
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Biology Past Questions and Answers

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Waec Biology Questions

Question 111:
WAEC 1990
Thunderstorm can be beneficial to plants because it
SchoolNGR Classroom
  • A Kills the pest that attacks crops
  • B Destroys some of the major crops
  • C Adds nitrates to the soil
  • D Adds lime to the soil
  • E Makes rain water available to plants
View Answer & Explanation
Question 112:
WAEC 1990
Which of the following is a nitrifying bacterium
SchoolNGR Classroom
  • A Nitrobacter
  • B Rhizobium
  • C Azotobacter
  • D Clostribium
  • E Nitrosomonas
View Answer & Explanation
Question 113:
WAEC 1990
Which of the following reagents is used for the test for starch?
SchoolNGR Classroom
  • A Million’s reagent
  • B Fehling’s’ solution
  • C Sudan III
  • D Iodine solution
  • E Benedict’s solution
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Question 114:
WAEC 1990
Which of the following is an autotrophic mode of nutrition?
SchoolNGR Classroom
  • A Chemosynthesis
  • B Saprophytism
  • C Parasitism
  • D Symbiosis
  • E Commensalism
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Question 115:
WAEC 1990
Which of the following is not a way of reducing air pollution?
SchoolNGR Classroom
  • A Siting factories and power stations away from residential areas
  • B Building tall factory chimneys
  • C Passing waste gases through filters and absorbers
  • D Using lead-free petrol in cars
  • E Recycling tins, cans and bottles
View Answer & Explanation

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