How does cytokinesis occur in an animal cell?

In the given figure, what does the part labeled "$R$" represent?

$A$ student observed a plant cell from a field in the telophase stage. He informed his teacher that the cell appeared different from other cells in telophase. The formation of the cell plate was not observed. Consequently,the cell contained a higher number of chromosomes compared to other dividing cells. This phenomenon results in $..........$.

$S$ - Statement: Cell division is an essential and important process observed in living organisms.
$R$ - Reason: In plant cells,cytokinesis begins from the central region of the cell.

During which phase does the distribution of organelles like mitochondria and chloroplasts into daughter cells occur?

Cytokinesis in plants takes place by the formation of