Question

________ cells re-enter the cell cycle from G${}_0$ phase.

• A. Heart cells
• B. Nerve cells
• C. Meristematic cells
• D. Cambium

Answer 1

The correct option is D Cambium

Cell cycle is an orderly sequence of events during which a cell grows, duplicates its genetic material and then undergoes division. The cells that do not divide further, temporarily or permanently, exit the cell cycle in $G_1$ phase and enter into a quiescent (inactive or dormant) stage called $G_0$ phase. Cells in the $G_0$ stage remain metabolically active but no longer divide. Metabolically active cell means that the cell will carry out all the metabolic reactions for its survival.

Heart cells and nerve cells permanently enter the $G_0$ phase.
Cells of cambium temporarily enter $G_0$ phase and in later part of plant’s life re-enter $G_1$ phase from $G_0$ phase. After entering the $G_1$ phase, the cell undergoes preparations to divide by synthesizing cellular contents. The cells of cambium divide forming new cells that cause secondary growth in plants.