At what stage of cell cycle does DNA synthesis take place?

If a tissue has at a given time 1024 cells, how many cycles of mitosis had the original parental single cell undergone?

An anther has 1200 pollen grains. How many pollen mother cells must have been there to produce them?

It is said that the one cycle of cell division in human cells (eukaryotic cells) takes 24 hours. Which phase of the cycle, do you think occupies the maximum part of cell cycle?

It is observed that heart cells do not exhibit cell division. Such cells do not divide further and exit ___________ phase to enter an inactive stage called ___________ of cell cycle. Fill in the blanks.