Match List-I with List-II and choose the correct answer from the options given below.

List - I	List - II
(a) S phase	(i) Proteins are synthesized
(b) G2 phase	(ii) Inactive phase
(c) Quiescent stage	(iii) Interval between mitosis and initiation of DNA replication
(d) G1 phase	(iv)  DNA replication

In the given matching problem we need to associate each cell‑cycle phase from List‑I with the correct description from List‑II.

List‑I contains the phases:

(a) S phase
(b) G2 phase
(c) Quiescent stage
(d) G1 phase

List‑II provides the descriptions:

(i) Proteins are synthesized
(ii) Inactive phase
(iii) Interval between mitosis and initiation of DNA replication
(iv) DNA replication

We examine each phase:

• S phase is the period when the cell duplicates its DNA. Therefore it matches description (iv) “DNA replication”.

• G2 phase follows DNA synthesis and is a preparatory stage where the cell synthesises proteins needed for mitosis. Hence it matches (i) “Proteins are synthesized”.

• Quiescent stage (also called G0) is a non‑dividing, metabolically inactive state. This corresponds to (ii) “Inactive phase”.

• G1 phase occurs after mitosis and before DNA replication; it is the gap period between the end of mitosis and the start of the S phase. Thus it matches (iii) “Interval between mitosis and initiation of DNA replication”.

Putting these correspondences together we obtain the matching:

a – iv, b – i, c – ii, d – iii