Question

Which of the following best describes 'seed-borne infection', as distinct from mere external 'seed contamination' by a plant pathogen?

A The pathogen is present only on the outer seed coat surface without penetrating tissue
B The pathogen is present in the surrounding soil, not on the seed
C The pathogen has actually penetrated and established itself within the internal seed tissue
D The pathogen only affects the seed after germination
E The pathogen is transmitted only through irrigation water
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