Question

Assertion (A): Due to inactivation of the cell cycle, some cells undergo G₀ phase.

Reason (R): Go phase occurs due to non-availability of mitogen and energy rich compounds.

विकल्प

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true and R is the correct explanation of A.

Explanation:

The assertion is true because when cells temporarily or permanently exit the active dividing cycle, they enter an inactive, quiescent phase known as the G₀ phase. The reason is also true and serves as the correct explanation because this withdrawal is a direct survival response triggered by the absence of extracellular growth factors (mitogens) or necessary energy reserves. Without these metabolic signals, the cell cycle cannot pass the regulatory checkpoints, forcing the cell into G₀.