Question

Explain the terms: (a) Root pressure

Answer 1

Osmosis

1. The passive diffusion that occurs through a semi-permeable membrane is referred to as osmosis.
2. Osmosis is the movement of water molecules from their higher concentration area to a lower concentration area.
3. The pressure required to stop the process of osmosis through a semipermeable membrane is referred to as Osmotic Pressure.

Root Pressure

1. Root pressure is a force or hydrostatic pressure produced in the roots that help in the upward movement of fluids and other ions from the soil into the vascular tissue (Xylem) of the plant.
2. Fluid can ascend through the stem to the leaves because of the osmotic pressure inside the cells of the root system.
3. Due to root pressure, water readily travels through the root tissues.
4. Because of osmosis, water molecules naturally move from areas of low mineral concentration to areas of high mineral concentration, and the flow of water into the root creates this required pressure.