Explain the process of water uptake by plants, identifying the structures and forces involved, and their adaptations.

a) The forces that push water from point A (soil/root) to point B (xylem) are root pressure and transpiration pull. Root pressure is a minor force, while transpiration pull, caused by the evaporation of water from leaves, is the main driving force.

b) Letter M represents the xylem.

c) The part marked N is a root hair cell.
It is adapted to its function by:

• Having a long, thin extension which greatly increases the surface area for efficient absorption of water and mineral salts from the soil.
• Possessing a thin cell wall and cell membrane to allow for rapid diffusion and osmosis of water and dissolved minerals.
• Containing a high concentration of solutes in its cell sap, creating a steep water potential gradient that facilitates water uptake by osmosis.