Cell turgor is the pressure exerted by the fluid inside a cell, pushing against the cell wall. This pressure is crucial for maintaining the rigidity and shape of plant cells. Think of it like a balloon filled with water – the water pressure inside keeps the balloon firm and prevents it from collapsing.
Here's how it works:
- Water uptake: Plant cells absorb water through osmosis, a process where water moves from an area of high concentration to an area of low concentration across a semi-permeable membrane.
- Turgor pressure builds: As water enters the cell, it increases the internal pressure, pushing against the cell wall. This pressure is known as turgor pressure.
- Cell rigidity: Turgor pressure is essential for maintaining the shape and structure of plants. It helps support stems, leaves, and flowers, allowing them to stand upright and perform their functions.
- Wilting: When plants lose water, turgor pressure decreases, causing the cells to become flaccid and the plant to wilt.
Examples of cell turgor in action:
- Plants standing upright: Turgor pressure in the stem cells allows plants to grow tall and stand erect.
- Leaves unfurling: The unfolding of leaves is driven by changes in turgor pressure within the leaf cells.
- Flowers opening: The petals of flowers are often controlled by changes in turgor pressure.
In summary, cell turgor is the internal pressure that gives plant cells their rigidity and helps them maintain their shape.
