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Assertion : Interphase occupies 75-95% o...

Assertion : Interphase occupies 75-95% of the total generation time.
Reason: Interphase (I-phase) is the long non-dividing phase.

A

If both assertion and reason are true and reason is the correct explantion of assertion

B

If both assertion and reason are true but reason is not the correct explnantion of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

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The correct Answer is:
To analyze the given assertion and reason, we can break down the solution into the following steps: ### Step 1: Understand the Assertion The assertion states that "Interphase occupies 75-95% of the total generation time." This means that during the cell cycle, the interphase takes up a significant portion of the time that a cell is preparing for division. ### Step 2: Understand the Reason The reason states that "Interphase (I-phase) is the long non-dividing phase." This indicates that during interphase, the cell is not actively dividing but is instead preparing for the next division. ### Step 3: Analyze the Phases of the Cell Cycle The cell cycle consists of two main phases: - **M-phase (Mitotic phase)**: This is the phase where cell division occurs. It is relatively short, taking only about 24 hours in human cells. - **Interphase**: This is the phase where the cell spends most of its time (approximately 75-95% of the total generation time) preparing for division. It includes G1 (Gap 1), S (Synthesis), and G2 (Gap 2) phases. ### Step 4: Correlate Assertion and Reason Both the assertion and the reason are true: - Interphase does indeed occupy a large portion of the cell cycle (75-95%). - Interphase is characterized as a long non-dividing phase where the cell prepares for division. ### Step 5: Conclusion The reason provided is a correct explanation for the assertion. Therefore, both the assertion and the reason are true, and the reason correctly explains why interphase occupies such a significant portion of the cell cycle. ### Final Answer Both the assertion and reason are true, and the reason is the correct explanation for the assertion. ---
To analyze the given assertion and reason, we can break down the solution into the following steps: ### Step 1: Understand the Assertion The assertion states that "Interphase occupies 75-95% of the total generation time." This means that during the cell cycle, the interphase takes up a significant portion of the time that a cell is preparing for division. ### Step 2: Understand the Reason The reason states that "Interphase (I-phase) is the long non-dividing phase." This indicates that during interphase, the cell is not actively dividing but is instead preparing for the next division. ...
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Knowledge Check

  • Assertion: Some cells enter G_(0) phase leasding to inactivation of cell cycle. Reason: G_(0) phase occurs due to non-availability of mitogen and enrgy rich compounds.

    A
    If both assertion and reason are true and reason is the correct explantion of assertion
    B
    If both assertion and reason are true but reason is not the correct explnantion of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Assertion: Prophase is the first stage of mitosis which follows S and G_(1) phases of interphase. Reason: Prophase is marked by the intiation of clusters of chromocomes.

    A
    If both assertion and reason are true and reason is the correct explantion of assertion
    B
    If both assertion and reason are true but reason is not the correct explnantion of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Assertion: Azeotropic mixtures are not formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components. Reason: The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true, but reason is not the correct explanation of assertion.
    C
    If assertion is true, but reason is false.
    D
    If both assertion and reason are false