<prompt> Lipid peroxidation as a cause of ageing and injury of cells is -Free redical theoryApoptosis theoryEnzyme cascade theoryCell destruction theory  <response>: Ans. is a i.e., Free redical theoryFree radicals produced during injury or aging cause oxidative decomposition of the lipid.Due to oxidative decomposition organic peroxides are formed after reacting with oxygen Lipid peroxidation. This reaction is auto-catalytic i.e. new radicals are formed from the peroxide radicals themselves. These radicals cause structural and functional breakdown of endoplasmic reticulum 