4x Unlike animal cells.plant cells have cell walls that make them rigid. Which organelle, other than the cell wall also plays a vital role in providing rigidity to plant cells? A Nucleus B Chloroplast Central vacuole D Endoplasmio reticulum

## Step 1<br />The problem is asking us to identify the organelle in plant cells, other than the cell wall, that plays a vital role in providing rigidity. The options provided are: A) Nucleus, B) Chloroplast, C) Central vacuole, and D) Endoplasmic reticulum.<br /><br />## Step 2<br />The nucleus (option A) is the control center of the cell, containing the cell's DNA. While it is essential for the cell's function, it does not directly contribute to the cell's rigidity.<br /><br />## Step 3<br />The chloroplast (option B) is the site of photosynthesis in plant cells. It is responsible for converting light energy into chemical energy, but it does not play a direct role in providing rigidity to the cell.<br /><br />## Step 4<br />The central vacuole (option C) is a large, fluid-filled organelle in plant cells. It plays a crucial role in maintaining the cell's turgor pressure, which is the pressure of the cell contents against the cell wall. When the central vacuole is full of water, it exerts pressure on the cell wall, providing rigidity to the cell.<br /><br />## Step 5<br />The endoplasmic reticulum (option D) is involved in the synthesis of proteins and lipids, but it does not play a direct role in providing rigidity to the cell.