The still part of a plant cell is called Cell Wall. This is the rigid outermost layer of a plant cell. It makes the cell stiff -providing the cell with mechanical support - and giving it protection. It is found just inside the cell wall and is made up of complex lipids (fats) and proteins.
stiff part in a plant cell
The "cell wall" which is lacked in animal cells is the outermost layer of a plant cell gives it its ridgedness.
The cell wall is an extra layer of protection for plant cells. The cell wall is stiff so as to keep the shape of the cell. Since plants must be stiff or else they will droop, having stiff cells makes that happen. Animal cells don't need to worry about having stiff cells because animal cells just float around throughout the organism...plant cells must be stiff and aligned next to each other.
Membranes do not have a stiff outside. I suspect the answer you are looking for is the cell wall, which is a stiff structure found outside the cell membrane of a plant cell, but separate from it.
Cell walls hold cells stiff so trees can grow tall. Cell membranes are flexible so animals can bend and move about. No tree can scratch itself where it itches. There is a disease that makes people so stiff they can not move. That would happen to everyone if they had cell walls.
it makes the cells more pliable, and more stretchy, like if you pinch your skin or rub it around, it moves more easily that the stiff leaves of plants.
Cell wall
Cell Wall
Membranes do not have a stiff outside. I suspect the answer you are looking for is the cell wall, which is a stiff structure found outside the cell membrane of a plant cell, but separate from it.
cell wall
Starch.