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Trichoderma is used in agriculture chiefly as

  • A.A nitrogen-fixing symbiont of cereal roots
  • B.A commercial source of streptomycin
  • C.A nitrifying organism that oxidises ammonium
  • D.A fungal biocontrol agent against root pathogens

Answer: D

Trichoderma species parasitise other fungi, compete for space on the root and induce plant defences, which is why they are formulated as seed and soil treatments. They fix no nitrogen and produce no streptomycin, which comes from Streptomyces.

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