Analogy type questions:
$(1)$ $S$-phase : $DNA$ synthesis :: $G_0$ phase : ...........
$(2)$ Cleavage furrow in animal cells : Periphery to center :: In plant cells : ................

(A) $(1)$ $G_0$ phase is known as the quiescent stage or inactive stage where cells remain metabolically active but do not proliferate unless called upon to do so.
$(2)$ In animal cells,cytokinesis occurs by the formation of a cleavage furrow that moves from the periphery to the center. In plant cells,cytokinesis occurs by the formation of a cell plate that grows from the center towards the periphery.