A root hair cell has a large surface area that is ideal for absorbing nutrients, and its sap has a higher salt concentration than the surrounding soil water. It has a semipermeable membrane that permits minerals and water molecules to enter but not to leave. Since it is responsible for providing nutrition and water to the plant, it possesses a tough wall that allows it to go deep underground.Continue Reading
A root hair cell is a very tiny extension of the root hair and is invisible to the unaided human eye. It grows from the tip of the root hair, has a diameter of between 10 to 17 micrometers and a length of 100 to 1500 micrometers. Its large surface area speeds up the absorption of water and nutrients through diffusion.
Root hair cells are continually formed at the tip of the root and stay alive for two to three weeks before dying. In legume plants, root hairs are involved in the formation of root nodules. After absorbing water and nutrients, the root hair cells pass these nutrients to the root of the plant for transportation to all its other parts. The root hair cell has five organelles, including the nucleus, plasma membrane, cytoplasm, vacuole and cell wall. It is protected by a strong wall, which also gives it its shape.Learn more about Cells
The size of a cell is limited by its surface area to volume ratio. As cells grow larger in volume, their surface area decreases and their ability to diffuse compounds in and out of the cell decreases as well.Full Answer >
As cells get larger, volume increases more rapidly than surface area. Since cells exchange materials and molecules across their membranes, a large cell has more difficulty transporting enough materials.Full Answer >
Cell sap is the liquid contained within a plant cell vacuole. The chemical composition of this liquid differs significantly from the materials contained outside the vacuole in the surrounding cytosol. This difference aids in the transfer of materials across the vacuole's membrane, called the tonoplast.Full Answer >
The main function of a plant root is to absorb water and minerals from the soil for the plant to use. Roots also anchor plants into the ground, offering them support and keeping them from washing or blowing away. In some plants, such as carrots, roots store carbohydrates that the plant has made through photosynthesis for later use.Full Answer >