With the help of suitable diagram, describe the cell cycle.

Exercise · Q19

Q. With the help of suitable diagram, describe the cell cycle.

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Diagram description (Fig. 7.1, Cell cycle): Draw a circular/looped diagram. Start at the top with 'Daughter cells' entering G1. Around the loop, mark the following labelled arcs in order:

Step 1. Interphase arc (the longest part of the loop), divided into three sub-arcs:

G1 (about 8 hours or more) — label with 'cell growth, normal cell function, organelle duplication'.
S (about 6-8 hours) — label with 'DNA replication'.
G2 (about 2-5 hours) — label with 'protein synthesis' (synthesis of proteins needed for division).

Step 2. Mitosis arc (about 1-3 hours), shown as a small arc broken into four labelled sub-stages in order: Prophase → Metaphase → Anaphase → Telophase.

Step 3. Cytokinesis, shown as the final small segment of the loop, which splits the cell into two daughter cells and returns the diagram back to the starting point (G1) of the next cell cycle. …

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2026Set ANNUAL1 markMCQ
$Q. The correct sequence in cell cycle is:$
(a) G1 - S - G2 - M
(b) S - M - G1 - G2
(c) M - G1 - G2 - S
(d) S - G1 - G2 - M
›Reveal solutionSolution
The correct order of the cell cycle is G1, then S, then G2, then M.

The eukaryotic cell cycle is divided into interphase (the period between two successive divisions, during which the cell is metabolically active but not dividing) and M phase (mitosis, where actual division occurs). Interphase itself is subdivided into three sequential sub-phases:

G1 (Gap 1): the cell grows, is metabolically active, and synthesises RNA/proteins needed for the coming S phase; the cell is NOT yet replicating DNA.

S (Synthesis): DNA replication occurs; the amount of DNA per cell doubles, but the chromosome number stays the same (each chromosome now has two sister chromatids).

G2 (Gap 2): further growth and synthesis of proteins needed for mitosis (e.g., tubulin for the spindle) takes place; the cell prepares to divide. …
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CBSE 2022Set ANNUAL1 markMCQ
$Q. The correct sequence in cell cycle is:$
(a) G1 - S - G2 - M
(b) S - M - G1 - G2
(c) M - G1 - G2 - S
(d) S - G1 - G2 - M
›Reveal solutionSolution
The cell cycle proceeds in the fixed order G1 (growth) → S (DNA synthesis) → G2 (preparation for division) → M (mitosis/cell division).

The cell cycle is divided into Interphase and M Phase (Mitotic phase):

Interphase (the 'resting' phase, though the cell is metabolically very active) is further divided into three sub-phases, in strict order:

G1 phase (Gap 1): the cell grows, synthesises RNA and proteins, and prepares for DNA replication.

S phase (Synthesis): DNA replication occurs, doubling the amount of DNA; the chromosome number remains the same but each chromosome now has two chromatids.

G2 phase (Gap 2): further protein synthesis and cell growth occur, and the cell prepares the machinery needed for mitosis. …
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←Previous question · 7.2.3.3Q18 — Enlist the different stages of prophase-I.→Next question · 7.2.3.3Q20 — Distinguish between mitosis and meiosis.

Q.With the help of suitable diagram, describe the cell cycle.

Concept understanding — Cell Cycle

Q.With the help of suitable diagram, describe the cell cycle.

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