The best stages to study the morphology and shape of a chromosome are respectively:

Yeast cell divides by

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

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Attachment site of spindle fibers	$(P)$ Cell cycle
$(2)$ Pairing of homologous chromosomes	$(Q)$ Kinetochores
$(3)$ Exchange of genes	$(R)$ Synapsis
$(4)$ Interval between two successive cell divisions	$(S)$ Crossing over

Which of the following statements are correct?
$I -$ Mitosis occurs in both haploid and diploid cells.
$II -$ Meiosis occurs in both haploid and diploid cells.
$III -$ Mitosis occurs only in haploid cells.
$IV -$ Mitosis occurs only in diploid cells.
$V -$ Meiosis occurs only in haploid cells.
$VI -$ Meiosis occurs only in diploid cells.

Statement $P$: The phase between two successive meiotic divisions is called interkinesis.
Statement $Q$: The period between two successive cell divisions is called the cell cycle.