If living cells similar to those found on Earth were found on another planet where there was no oxygen,which cell organelle would most probably be absent?

Read the statements $P$ and $Q$:
$P$: The number of mitochondria in each cell does not depend on the physiological activity of the cell.
$Q$: Mitochondria are present in both plant and animal cells.
Select the correct option from the given choices.

The organelle in which the oxidative process of respiration occurs is known as ......

Select the incorrect statement regarding mitochondria.

Where does cellular respiration take place?

Which of the following observations most strongly supports the view that mitochondria contain electron transfer enzymes aggregated into compact associations?