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Agricultural Science 2009 WAEC Past Questions

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11
It is not advisable to apply fresh farmyard manure because
  • A. its heat of decomposition may cause scorching of plants
  • B. some microorganisms in the manure may die
  • C. the manure may increase soil acidity
  • D. the manure may increase soil alkalinity
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12
Magnesium deficiency in crops can be corrected by the application of
  • A. dolomite
  • B. limestone
  • C. quicklime
  • D. urea
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13
The atmosphere gains carbon dioxide through the following ways except
  • A. burning of fuel such as coal and wood
  • B. respiration by plants and animals
  • C. photosynthesis in plants
  • D. death and decay of plants and animals
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14
Controlled burning has the advantage of
  • A. increasing the number of soil organisms
  • B. inducing re-growth of pasture grasses
  • C. increasing the amount of nutrients in the soil
  • D. improving soil structure
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15
Which of the following fertilizers should be applied for good plant growth after prolonged use of sulphate of ammonia on a neutral soil?
  • A. ammonium nitrate
  • B. lime
  • C. urea
  • D. single superphosphate
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