Biology (Grade 9): High School Learning: CELL WALL:
Cell Wall- A Protective layer surrounding the cell on the outside of the plasma membrane.
Cell Wall is only present in plant cell.
Cell Wall consists of 3 layers.
- Middle lamellla.- Outer wall.
- Primary Wall- Formed after middle lamella and consists of a skeleton of cellulose microfibrils, embedded in gel like matrix of pectic compounds, hemicellulose, and glucoprotein.

- Secondary Wall:
Formed after cell enlargement is completed , provides compression strength.

- Plasmodesmata: Connection between cells,A microscopic channels through the cell walls and lamella.

Cell Wall and Turgor:
- Cell Wall is made of neutral and charged polysacchrides absorbs H2O because it has a hypotonic environment.

- Increased H2O in the cell – Turgor Pressure. If a plant cell is turgid . it is very form , a healthy state in the most plant,If plant is flacid . it is isotonic solution.

Difference between CELL MEMBRANE and CELL WALL.

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