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The serial dilution and plating method estimates

  • A.The number of culturable microorganisms in a soil sample
  • B.The total mass of organic matter held in a given soil
  • C.The proportion of clay in a given soil sample
  • D.The rate at which nitrogen is fixed in the soil

Answer: A

Counting colonies on a plate from a known dilution gives colony forming units per gram, but only for organisms that grow on the chosen medium. Since most soil organisms do not, the method is known to understate the true population by a very large margin.

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