What is the period between two successive cell divisions called?

Assertion $A$: During interphase,the genetic material exists as chromatin.
Reason $R$: During interphase,chromosomes are present as thread-like structures.
Which option is correct for Assertion $A$ and Reason $R$?

In which phase does the centriole duplicate?

$A$ biosynthetic phase where cell organelles duplicate themselves is:

Which of the following statements is true for cells in the $G_0-$stage of the cell cycle?

In the given figure,what does $G_2$ represent?