How does a dandelion curl up in water?

When a dandelion is placed in water, its petals and leaves can curl up due to the absorption of water, causing the plant cells to swell. This process, known as turgor pressure, occurs as water enters the plant's cells through osmosis, causing them to expand. Additionally, the change in moisture can lead to a temporary loss of structural integrity in the plant's tissues, resulting in the curling effect. This response helps the plant manage water levels and maintain its overall health.