State that plants are supported by the pressure of water inside the cells pressing outwards on the cell wall

Plants are supported by the pressure of water inside their cells, which presses outward on the cell wall.

Explanation of Turgor Pressure

Turgor Pressure Defined

• Turgor pressure is the pressure exerted by the fluid (usually water) within the central vacuole of plant cells against the cell wall. This pressure is essential for maintaining the structural integrity and rigidity of plant tissues.

Mechanism of Support

1. Water Uptake: When plant cells absorb water through osmosis, the vacuole fills with water, increasing its volume.
2. Pressure Against Cell Wall: As the vacuole expands, it pushes against the cell membrane, which in turn presses against the rigid cell wall.
3. Maintaining Structure: This outward pressure from the inside helps keep the plant cells turgid (firm and swollen), providing support to the plant structure, allowing it to stand upright and maintain its shape.

Importance of Turgor Pressure

• Support for Plant Growth: Turgor pressure is crucial for young plants and seedlings, enabling them to grow and expand.
• Nutrient Transport: It also plays a role in transporting nutrients and water throughout the plant.
• Preventing Wilting: Adequate turgor pressure prevents wilting in plants, ensuring they remain healthy and functional.