Absorption by roots
Plants take water and minerals from the soil through their roots. The process by which plants take-up these substances from soil is known as absorption.
Water is vital to every function of a plant, from growth and photosynthesis to hydration. Actively growing plant contains 85-90% of their weight as water.
Water absorbed by the roots is important for:
Transportation of substances
Food production and
Land plants have effective and well developed transport system. Transport system move the substances absorbed in roots to various other parts of the plant such as stem, leaves etc.
Root system of plant consists of main root and the lateral roots. Root hairs are the fine outgrowth in roots. Plant roots provide anchorage to the plant.
Movement of water molecules occurs by the process of diffusion, osmosis and active transport.
Diffusion is a simple process of movement of molecules such as gas, liquid or solid from the region of higher concentration to lower concentration.
Osmosis is the movement of water molecule from the region of higher concentration to the region of lower concentration through a semi-permeable membrane.
Active transport involves the movement of molecules from the region of lower concentration to the region of higher concentration, utilising energy in the form of ATP molecules.
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