Why don't plant cells use a contractile ring to divide their daughter cells?

Question

Quizplus · Accepted Answer

A contractile ring is made of actin filaments and myosin motor proteins, which constrict and "pinch" the cell membrane to divide it. However, plant cells have a rigid cell wall outside of the plasma membrane, which a contractile ring cannot constrict. Instead, plant cells form a cell plate during cytokinesis, which eventually becomes the new cell wall between the daughter cells.

Why Don't Plant Cells Use a Contractile Ring to Divide