Final answer:
The G1 phase is the part of the cell cycle that is responsible for the physical growth of the cell.
Step-by-step explanation:
The phase that entails the physical growth of the cell is the G1 phase. During this phase, cells increase in size, perform their normal activities, and prepare for subsequent phases of the cell cycle. The G1 phase is part of interphase, which is subdivided into three stages: the G1 phase (first gap or growth phase), the S phase (synthesis phase, where DNA replication occurs), and the G2 phase (where growth continues and preparation for mitosis takes place).