Which element of mitochondria is important i limiting the fo
     Which element of mitochondria is important i limiting the formation of oxidative radicals?  Photosystem ll  the NADH dehydrogenase complex  Ferrodoxin NADP reductase  the cytochrome oxidase complex 
  
  Solution
Answer is the NADH dehydrogenase complex.
Photosystem II is not related with mitochondria hence option 1 is not correct.
Ferrodoxin NADP reductase and cytochrome oxidase complex would not produce superoxide which can scavenge free radicals hence option 3 and four also not correct.
NADH dehydrogenase complex can produce superoxide which can scavenge free radicals and limit the formation of free radicals.
Hence option 1 is correct answer.

