During which phase$(s)$ of the cell cycle does the amount of $DNA$ in a cell remain at the $4C$ level, if the initial amount is denoted as $2C$?

Select the correct option $:-$

Column $-I$	Column $-II$
$(a)$ Synapsis aligns homologous chromosomes	$(i)$ Anaphase$-I$
$(b)$ Synthesis of tubulin protein	$(ii)$ Zygotene
$(c)$ Action of enzyme recombinase	$(iii)$ $G_2$-phase
$(d)$ Centromeres split and chromatids move towards opposite poles	$(iv)$ Anaphase$-II$
	$(v)$ Pachytene

Which of the following statements are correct?
$a -$ Cell cycle duration can vary from organism to organism and also from cell type to cell type.
$b -$ $DNA$ synthesis occurs only in pachytene.
$c - G_1$ phase corresponds to the interval between mitosis and initiation of $DNA$ replication.

Which element is required for the formation of the bipolar spindle during cell division?

Select the correct option for the following matches:

List-$I$	List-$II$
$(1)$ Metaphase-$I$	$(a)$ Number of chromosomes becomes half of the parent cell
$(2)$ Anaphase-$I$	$(b)$ Each chromosome splits at the centromere to form chromatids
$(3)$ Anaphase-$II$	$(c)$ Homologous chromosomes form pairs at the equatorial plate
$(4)$ Telophase-$II$	$(d)$ Homologous chromosomes move towards opposite poles

Select the matched ones.
$I.$ $S$-phase - $DNA$ replication
$II.$ Zygotene - Synapsis
$III.$ Diplotene - Crossing over
$IV.$ Meiosis - Shown by haploid and diploid cells
$V.$ $G_{2}$-phase - Quiescent stage