The model shows a step in the process of cell division.
What has to develop from the cell plate (pinkish line between nuclei) for the plant cell to complete cytokinesis?
a
cell wall
b
nuclear membrane
c
centrioles
d
spindle fibers
a) cell wall
To complete cytokinesis in a plant cell, the cell wall needs to develop from the cell plate, which is the pinkish line between the nuclei. Therefore, the correct answer is a) cell wall.
To determine the correct answer, let's start by understanding the process of cell division and cytokinesis in plant cells. Cell division involves two main stages: nuclear division (mitosis) and cytoplasmic division (cytokinesis).
During mitosis, the genetic material in the nucleus of a cell is divided equally into two daughter nuclei. Following mitosis, cytokinesis occurs, where the cytoplasm is divided to form two separate daughter cells.
In animal cells, cytokinesis typically involves the formation of a cleavage furrow, which is a contracting ring of microfilaments that pinches the cell in two. However, in plant cells, the presence of a rigid cell wall prevents the formation of a cleavage furrow.
Instead, during cytokinesis in plant cells, a structure called the cell plate forms in the middle of the dividing cell. The cell plate is made up of vesicles that contain cell wall materials, along with other cell components.
Now, considering the options provided:
a) cell wall: The cell plate is directly involved in the formation of the new cell wall, so this option is likely to be correct.
b) nuclear membrane: The nuclear membrane does not have a direct role in cytokinesis.
c) centrioles: Centrioles play a role in animal cell division (forming the spindle fibers), but they are not involved in cytokinesis in plant cells.
d) spindle fibers: Spindle fibers are involved in mitosis (nuclear division), not cytokinesis.
Based on this information, the correct answer is a) cell wall. The cell wall develops from the cell plate during cytokinesis in plant cells.