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A soil with a very low organic matter content will generally support

  • A.A small microbial population limited by carbon supply
  • B.A large microbial population limited only by moisture
  • C.A population dominated by photosynthetic organisms
  • D.The same population as a soil rich in organic matter

Answer: A

Nearly all soil organisms are heterotrophs and depend on organic carbon for both energy and cell material, so where organic matter is scarce the population is small however favourable the other conditions. This is why building organic matter is the surest way to raise biological activity.

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