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  4. Assertion: G1 phase is the interval between mitosis and initiation of DNA replication. Reason: The cell is metabolically inactive during G1 phase.

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Q. Assertion : $G_{1}$ phase is the interval between mitosis and initiation of $DNA$ replication.
Reason : The cell is metabolically inactive during $G_{1}$ phase.

Cell Cycle and Cell Division

Solution:

G1 phase is also known as first growth phase or post mitotic gap phase. It is the phase between end of mitotic phase of previous cell and initiation of $S$-phase of next mitotic phase. During $G_{1}$ phase the cell is metabolically active and continuously grows. In this phase different types of $RNA (mRNA, tRNA$ and $rRNA$) and proteins are synthesised.