Root Zone for Water and Mineral Absorption in Diagram
In the diagram, the part of the root responsible for water and mineral absorption is the root hair zone. This zone is located near the tip of the root and is covered in tiny, hair-like structures called root hairs. These root hairs greatly increase the surface area of the root, allowing for more efficient absorption of water and minerals from the soil.

Function of Root Hair Zone
The root hair zone is where the majority of water and mineral absorption takes place in the root. The root hairs are in close contact with the soil particles, which allows them to absorb water and minerals through a process called osmosis. Osmosis is the movement of water from an area of high concentration to an area of low concentration through a semi-permeable membrane, in this case, the root hair cell membrane.

Importance of Water and Mineral Absorption
Water and minerals are essential for plant growth and development. Water is needed for photosynthesis, nutrient transport, and turgor pressure in plant cells. Minerals, such as nitrogen, phosphorus, and potassium, are essential for various metabolic processes in plants. Without an efficient system for water and mineral absorption, plants would not be able to survive or thrive.

Conclusion
In conclusion, the root hair zone is crucial for water and mineral absorption in plants. The root hairs in this zone play a significant role in increasing the surface area of the root and facilitating the absorption of water and minerals from the soil. This process is essential for the growth, development, and overall health of plants.