Which event completes cell division even though it is not a part of mitosis?

Which independent event completes the process of cell division?

How does cytokinesis occur in plant cells?

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

Failure of cytokinesis after $A$ stage of cell division results in an increase in a whole set of chromosomes in an organism called $B$.

Cytokinesis in plants takes place by the formation of