Given that the average duplication time of $E. coli$ is $20$ minutes, how much time will two $E. coli$ cells take to become $32$ cells?

What happens during mitosis?

Identify the correct statements.
$(i)$ Somatic cells undergo mitosis,and germ cells undergo meiosis.
$(ii)$ During mitosis,$DNA$ replicates once for one cell division,and in meiosis,$DNA$ replicates twice for two cell divisions.
$(iii)$ Meiosis and mitosis are observed in organisms that reproduce both sexually and asexually.

The phases of the cell cycle are given below. Which of the following options correctly identifies the phase represented by the labels?

Match the following columns correctly:

Column $I$	Column $II$
$(a)$ $G_1$ phase	$(p)$ Synthesis of new $DNA$ occurs
$(b)$ $G_2$ phase	$(q)$ No $DNA$ synthesis occurs
$(c)$ $S$ phase	$(r)$ $DNA$ synthesis stops
$(d)$ Prophase	$(s)$ Formation of mitotic spindle occurs

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