Also known as Alternative NAD(P)H-ubiquinone oxidoreductase C1, chloroplastic/mitochondrial (Alternative NADH dehydrogenase NDC1) (Demethylphylloquinone reductase NDC1) (NADH:ubiquinone reductase (non-electrogenic) NDC1). Bifunctional oxidoreductase ables to act both on prenyl naphthoquinones and on prenyl benzoquinones (PubMed:21844348, PubMed:26023160). May serve a respiratory function (PubMed:12972666). Involved in an electron flow toward the plastoglobule plastoquinone pool (PubMed:21844348, PubMed:25018761). Required for plastochromanol-8 accumulation and for phylloquinone (vitamin K1) production (PubMed:21844348, PubMed:25018761). Probably not directly involved in cyclic or chlororespiratory electron flows under standard growth conditions, but participates in the redox metabolism of plastoquinone-9 and the tocophrol recycling-intermediate alpha-tocopherol quinone (PubMed:21844348, PubMed:25018761). Catalyzes the penultimate step in the biosynthesis of vitamin K1 (PubMed:26023160).