Which of the following organelles contain ribosomes?

$i.$ The shape of the cells may vary with the function they perform.
$ii.$ Human $RBC$ is about $7.0 \, \mu m$ in diameter.
$iii.$ Cytoplasm is the main arena of cellular activities.
$iv.$ Various chemical reactions occur in cytoplasm to keep the cell in the living state.

What is the full form of $EM$?

What is the contribution of cytoplasmic $DNA$ to the total $DNA$ in a cell?

Match column-$I$ with column-$II$ and choose the correct option.

Column-$I$	Column-$II$
$A$. Tonoplast	$I$. Contain digestive enzyme
$B$. Contractile vacuole	$II$. Store metabolic gases
$C$. Food vacuole	$III$. Excretion
$D$. Air vacuole	$IV$. Transport of ions in plants

The cell is considered one of the wonders of the world because...