Which is true about certification?1.As far as possible only seeds certified as pathogen free are allowed to enter the country.2.Other planting materials can be allowed to enter the country without certification.3.Quarantine is needed for the seeds from foreign countries while it is certified.4.Quarantine is not needed for the seeds from foreign countries while it is certified.5.Is meant to prevent existing pathogens.6.Isn’t meant to prevent existing pathogens.

Plant pathology is the science that studies the causes of plant diseases, the mechanisms by which diseases develop in individual plants and in plant populations, and the ways and means by which plant diseases can be managed or controlled.