During which phase do the centromeres lie on the equatorial plate and the arms point towards the poles?

Which of the following features is common to both mitosis and meiosis?

$A$ cell at the telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at the telophase stage. There is no formation of a cell plate,and thus the cell contains a higher number of chromosomes compared to other dividing cells. This would result in:

Match the following columns correctly:

Column-$I$	Column-$II$
$(A)$ Prophase	$(i)$ Nuclear envelope and other organelles reform
$(B)$ Metaphase	$(ii)$ Chromosomes align at the equator
$(C)$ Anaphase	$(iii)$ Formation of spindle fibers
$(D)$ Telophase	$(iv)$ Splitting of centromere and chromatid separation
$(E)$ Cytokinesis	$(v)$ Formation of multinucleated condition

Identify the incorrect statements:
$(1)$ Meiosis involves only a single cycle of $DNA$ replication.
$(2)$ At the end of Meiosis-$I$,four haploid cells are formed.
$(3)$ Mitosis is generally restricted to diploid cells.
$(4)$ In yeast,the cell cycle takes approximately $90$ minutes to complete.

For a cell,$n \rightarrow 2n$ $(P)$ and $2n \rightarrow n$ $(Q)$. What are $P$ and $Q$?