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The specificity by which a given Rhizobium strain nodulates only certain legume species is called

  • A.Serial dilution
  • B.Competitive exclusion of strains
  • C.Antibiosis
  • D.Cross-inoculation grouping

Answer: D

Legumes and rhizobia are sorted into cross-inoculation groups, within which any strain can nodulate any host but across which it generally cannot, which is why inoculant must be matched to the crop. The other terms describe a counting method and two forms of microbial interference.

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