Oxidative phosphorylation occurs in

In the $ETS$ (Electron Transport System),the final electron acceptor is .......

In mitochondria,protons accumulate in the

The complex $II$ of mitochondrial electron transport chain is also known as

Given below are two statements.
$Statement-I$: During aerobic respiration, $ETS$ releases energy in a stepwise manner to prevent damage to cells.
$Statement-II$: During aerobic respiration, $ETS$ provides water molecules.
In the light of the above statements, choose the correct answer from the options given below.

Which of the following processes takes place in the mitochondria?