Why doesn't the cell membrande pinch in to divide the cytoplasm telophase in plant cells?
The reason why the cell membrane doesn't pinch in to divide the cytoplasm during telophase in plant cells is because plant cells have a rigid cell wall surrounding their cell membrane. This cell wall provides structural support and protection to the plant cell, but it also poses a challenge during cell division.
During telophase, when the nuclear material has already divided into two sets and the chromosomes have reached opposite poles of the cell, a contractile ring called the cleavage furrow begins to form in animal cells. This ring gradually contracts, pinching the cell membrane inward, resulting in the separation of cytoplasm into two daughter cells. However, in plant cells, the presence of the cell wall prevents the formation of a cleavage furrow and subsequent pinching of the cell membrane.
Instead, plant cells undergo a different process called cytokinesis. During cytokinesis, a new cell wall forms between the two daughter nuclei. This new cell wall is synthesized by the Golgi apparatus and other vesicles in the cell. They deliver materials to the middle region of the cell, where they fuse together to form a cell plate. The cell plate gradually extends outwards, separating the cytoplasm into two distinct daughter cells with their own cell membranes and cell walls.
So, in summary, the reason plant cells do not pinch in the cell membrane during telophase is due to the presence of the rigid cell wall, which necessitates the formation of a new cell wall through cytokinesis instead.