Question

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 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

Answer 1

Answer: (B)

The cell cycle is divided into two basic phases: (I) Interphase, (II) $M$-phase. The $M$ phase represents the phase when the actual cell division or mitosis occurs and the interphase represents the phase between two successive $M$ phases. In the $24$ hour average duration of cell cycle of human cell, cell division proper lasts for only about an hour. The interphase lasts more than $95\%$ of the duration of cell cycle.