Choose the correct option for the formation and disappearance of the bipolar spindle in a cell,respectively.

Which chromosome may be lost during cell division?

$(1)$ Give scientific reason: Meiosis is called reductional division.
$(2)$ Give scientific reason: Mitosis is necessary for growth,development,and repair of the cell.

In which of the following does mitosis not occur?

In ...$A$.... phase,there is synthesis of $RNAs$ and proteins that are needed for cell growth and replication of $DNA$. While it is ...$B$... phase,where synthesis of protein occurs that is needed for spindle formation and mitosis to continue.
Identify $A$ and $B$ to complete the given statement.

Match the following events that occur in their respective phases of cell cycle and select the correct option:

Column $I$	Column $II$
$(a)$ $G_{1}$ phase	$(i)$ Cell grows and organelle duplication
$(b)$ $S$ phase	$(ii)$ $DNA$ replication and chromosome duplication
$(c)$ $G_{2}$ phase	$(iii)$ Cytoplasmic growth
$(d)$ Metaphase in $M$-phase	$(iv)$ Alignment of chromosomes