White blood corpuscles divide by

Which is the direct or primitive type of cell division?

During cell division,sometimes there will be failure of separation of sister chromatids. This event is called

Write briefly the significance of mitosis and meiosis in multicellular organisms.

Given below is a schematic representation of the phases/stages of the cell cycle. Which one of the following is the correct indication of the stage/phase in the cell cycle?

Match List-$I$ with List-$II$ :

List-$I$ (Phase of cell cycle)	List-$II$ (Activity)
$A$. $G_1$ phase	$I$. Actual cell division occurs
$B$. $S$ phase	$II$. Cell is metabolically active and continuously grows but does not replicate its $DNA$
$C$. $G_2$ phase	$III$. Synthesis of $DNA$ occurs and the amount of $DNA$ per cell doubles
$D$. $M$ phase	$IV$. Proteins are synthesized while cell growth continues

Choose the correct answer from the options given below :