Functions of Turgor Pressure and Lignification
Turgor pressure and lignification are crucial for maintaining support in plants. Turgor pressure is the pressure of the cell contents against the cell wall, which is vital for:
- Maintaining cell shape: It keeps plant cells rigid and prevents wilting.
- Facilitating growth: Turgor pressure helps in cell expansion during growth phases.
- Transport of nutrients: It aids in the movement of water and nutrients through plant tissues.
Lignification refers to the process of deposition of lignin, a complex organic polymer, in cell walls, which enhances:
- Structural strength: Lignin provides rigidity and strength to woody plants, allowing them to grow tall.
- Resistance to decay: Lignified cells are more resistant to pathogens and environmental factors.
- Water conduction: Lignin helps in the formation of xylem vessels, essential for water transport.
Understanding these functions is vital as they illustrate how plants maintain their structure and adapt to their environments.
Key points to remember
- Turgor pressure maintains cell shape and prevents wilting.
- It facilitates growth by aiding cell expansion.
- Lignification provides structural strength to plants.
- Lignin enhances resistance to decay and pathogens.
- Lignified cells are crucial for efficient water conduction.
Worked example
State two functions of turgor pressure in plants.
- Turgor pressure maintains cell shape and prevents wilting.
- It facilitates the transport of nutrients and water.