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Discussion

Plant viruses commonly spread from plant to plant by

  • A.airborne spores
  • B.insect vectors
  • C.flagellar motility of the virion
  • D.active penetration of intact cuticle

Answer: B

A plant cell is protected by a wall and a cuticle that a virion cannot breach unaided, so most plant viruses rely on a vector, typically a sap-feeding insect such as an aphid or a leafhopper, to deliver them past that barrier. Mechanical wounding serves the same purpose experimentally.

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