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Actinomycetes are most abundant in soils that are

  • A.Permanently frozen and low in organic matter
  • B.Highly saline and completely anaerobic
  • C.Warm, dry and neutral to slightly alkaline
  • D.Cold, waterlogged and strongly acidic

Answer: C

Actinomycetes tolerate dryness better than most bacteria but are among the least acid-tolerant groups, so they thrive in warm neutral to alkaline soils and dwindle as pH falls. Their filamentous growth also lets them bridge dry gaps between soil particles.

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