Match the following events that occur in their respective phases of cell cycle and select the correct option:

Column - I Column - II

(a) $G_{1}$ phase (i) Cell grows and organelle duplication

(b) S phase (ii)
DNA replication and chromosome duplication

(c) $G_{2}$ phase (iii) Cytoplasmic growth

(d) Metaphase in M-phase (iv)
Alignment of M-phase chromosomes

(a) - (i i), (b) - (i i i), (c) - (i v), (d) - (i)

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(a) - (i i i), (b) - (i v), (c) - (i), (d) - (i i)

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(a) - (i v), (b) - (i), (c) - (i i), (d) - (i i i)

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(a) - (i), (b) - (i i), (c) - (i i i), (d) - (i v)

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Solution

The correct option is D $(a) - (i), (b) - (i i), (c) - (i i i), (d) - (i v)$
Cell cycle is an orderly sequence of events during which a cell grows, duplicates its genetic material and then undergoes division.

Cell cycle includes a non-dividing phase, the interphase, and a dividing phase, the mitotic phase (M phase).

Interphase is of long duration and is divided into $G_{1}$ , S and $G_{2}$ phases.

During the $G_{1}$ phase, cells are metabolically active and cellular contents are synthesised (cell organelles, proteins, RNA) and, thus, there is overall cell growth.

Hence, $G_{1}$ phase - cell grows and organelle duplication (a-i)

During S phase, DNA undergoes replication and makes a complimentary copy of itself. The total content of DNA gets doubled.

Hence, S phase - DNA replication and chromosome duplication (b-ii)

During $G_{2}$ phase, proteins like tubulin needed for cell division are synthesised and the cytoplasmic growth continues.

Hence, $G_{2}$ phase - cytoplasmic growth (c-iii)

During the metaphase of M phase (mitotic phase), chromosomes align in the centre of the cell.

Hence, metaphase in M-phase - alignment of M-phase chromosomes (d-iv).

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(A)	Second gap phase	-	Cytoplasmic growth continues
(B)	First gap phase	-	Initiation of replication
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phase) is considered as C and the number of chromosomes

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Column - I	Column - II
(a)	$G_{1}$ phase	(i)	Cell grows and organelle duplication
(b)	S phase	(ii)	DNA replication and chromosome duplication
(c)	$G_{2}$ phase	(iii)	Cytoplasmic growth
(d)	Metaphase in M-phase	(iv)	Alignment of M-phase chromosomes