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.

Sure, here are the step by step solutions: 1. The cell cycle is divided into two basic phases: interphase and M-phase. 2. The M-phase represents the phase when the actual cell division or mitosis occurs. 3. The interphase represents the phase between two successive M phases. 4. In the 24-hour average duration of the cell cycle of a human cell, cell division proper lasts for only about an hour. 5. The interphase lasts more than 95% of the duration of the cell cycle.