Explain how the arrangement of microfibrils and secondary thickening contribute to physical properties of plant fibres.
- 1. Cellulose microfibrils and matrix build up on either side of middle lamella.
- 2. Primary cell wall: First to form, cellulose microfibrils laid down is the same direction.
- 3. Secondary cell wall: As the plant ages, the microfibrils are laid down at right angles to those in the primary wall. Strengthens cell wall.
- 4. In some plants cell walls are lignified. This strengthens the walls further. Long cells with cellulose walls that have been lignified are known as plant fibres.
Plant fibres are extracted and used for many things, e.g rope, clothes, paper