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Biology 1990 WAEC Past Questions

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36
Which of the following is the effect of using artificial pollination in plant breeding?
  • A. Production of healthy crops
  • B. Improvement of the variety of crops
  • C. Making crops susceptible to diseases
  • D. Lengthening the maturity time of crops
  • E. Encouraging competition amongst crops
View Answer & Discuss WAEC 1990
37
A dry indehiscent fruit containing one seed and possessing a hairy pappus is described as
  • A. a nut
  • B. a drupe
  • C. a cypsela
  • D. a follicle
  • E. an achene
View Answer & Discuss (1) WAEC 1990
38
Thunderstorm can be beneficial to plants because it
  • 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 & Discuss WAEC 1990
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39
Which of the following is a nitrifying bacterium
  • A. Nitrobacter
  • B. Rhizobium
  • C. Azotobacter
  • D. Clostribium
  • E. Nitrosomonas
View Answer & Discuss (2) WAEC 1990
40
Which of the following reagents is used for the test for starch?
  • A. Million’s reagent
  • B. Fehling’s’ solution
  • C. Sudan III
  • D. Iodine solution
  • E. Benedict’s solution
View Answer & Discuss (1) WAEC 1990
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