explain the conduction of water and mineral in plant.
Answers
Explanation:
It transports water and soluble mineral nutrients from roots throughout the plant. When stomata closes then transpiration stops and water is held in stem and leaf by water molecules cohesion to each other and adhesion of water to walls of xylem vessels and tracheids.
Plants have the potentiality to absorb water through their entire surface right from root, stem, leaves, flowers, etc. However, as water is available mostly in the soil, only the underground root system is specialized to absorb water.
Roots are often extensive and grow rapidly in the soil.
In roots, the most efficient region of water absorption is the root hair zone. Each root hair zone has thousands of root hairs. Root hairs are specialized for water absorption. They are tubular outgrowths of 50-1500 m (0.05-1.5 mm) length and 10 nm in breadth.
Each root hair has a central vacuole filled with osmotically active cell sap and a peripheral cytoplasm. The wall is thin and permeable with pectic substances in the outer layer and cellulose on the inner layer. Root hairs pass into capillary micropores, get cemented to soil particles by pectic compounds and absorb capillary water.
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