Sub-micron plastics (SMPs, size < 1 µm) are potentially taken up by plants. Serious concerns arise that how far SMPs can transfer from plants into food webs. Here, we show lettuce takes 250 nm gadolinium labelled polystyrene (PS) and polyvinyl chloride (PVC) the soil. The polymer type influences biodistribution of particles in (roots leaves) number transferred to insects feeding on treated lett...