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Assertion (A): The proportion of cells seen in a given phase indicates how long that phase lasts.
Reason (R): In an unsynchronised population, cells are distributed across the cycle in proportion to phase length.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason supplies the logic: a phase occupying a tenth of the cycle will contain about a tenth of the cells at any instant, which is what makes a single fixed sample informative. No time-lapse observation is needed to estimate the phase durations.

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