Ten out of 14 types of plastic bags sold in grocery stores, convenience stores and shopping centers have been found be carrying false labels marking them as biodegradable and environmentally friendly, the Taipei-based Consumers’ Foundation said Wednesday. The plastic bags in question break into tiny pieces during the natural process of degradation, but are nevertheless promoted as biodegradable, said Ling Young-chien , chief inspector of the foundation, a non-profit organization devoted to consumers’ rights.