Question

The possibility of being the outermost layer of cells is highest for which of the following?
A. Plasmalemma
B. Cell membrane
C. Middle lamella
D. Primary wall

Answer 1

Hint: The cell membrane is present inside of the cell wall, which is made up of the middle lamella, primary wall, and the secondary wall, plasmodesmata are connections that are found to connect two adjacent cells to one another.
These connections are also common only to plant cells.

Complete answer: Plants cells are different from animal cells because of the presence of a cell wall that covers the plasma membrane of the cell.
1. The cell wall maintains the shape of the cell and helps in controlling the entry of substance inside the plasma membrane.
2. The cell wall is made up of 3 layers which are the middle lamella, primary cell wall, and the secondary cell wall.
3. The outermost layer of a cell membrane is the middle lamella and hence it is also said to being the outermost membrane of a cell. It is made up of calcium and magnesium pectate.
4. Its major function is to aid the connection between the cell wall is 2 cells and it archives the same using plasmodesmata connections.

Note: It should be noted that the presence of a cell wall is a distinctive feature o plant cells, which is not found in animals.
In the case of animals, the outermost layer will be the plasma membrane or the cell membrane and in the case of prokaryotes, it is the capsule or the slimy layer.