Seed Treatment Category 4 Practice Test

Over-application creates a thick, dense coating that acts as a barrier to the seed’s water and gas exchange. Water has to move into the seed during imbibition to trigger metabolic and growth processes; a heavy coating slows or blocks this water uptake, leading to slower or failed germination. The coating can also alter the seed’s immediate micro-environment—retaining excess moisture, changing temperature exposure, or concentrating chemicals—which stresses the seed and can reduce viability or emergence speed. Because of these effects, applying too much coating is more likely to hinder germination than to help, and claims that it has no effect or that it would improve germination don’t align with how seed coatings interact with seed physiology. Taste is not relevant to seeds, so that option doesn’t fit with how seed treatments influence viability.