WHAT DIFFUSION IS- ROLE & IMPORTANCE
DEFINITION
The movement of substances or molecules, atoms, ions from the region of higher concentration to the region of lower concentration is called diffusion.
The basic meaning of diffusion is “to spread out” and the term is used in many fields like physics, chemistry, biology, extension education etc.
IMPORTANT POINTS
- In living things, substances move in and out of cells by diffusion. Therefore, it is an important process for living things.
- Diffusion happens in liquids and gases because their molecules move randomly from place to place.
- The particles of liquids, gases moves from an area of high concentration to an area of low concentration until the molecules are evenly distributed throughout the available space.
Here the term is described mainly with respect of plant physiology.
Role & Importance
- The movement of substance within a plant, i.e., from one part of a plant to another, is mainly by diffusion. Plants require water, minerals, and food for their growth and survival. Water and minerals are taken up by root hairs and leaves are the source of photosynthesis where food is prepared. so, it is the means of transportation of these materials in plants.
- In higher green plants, some substances enter the living cells through the aerial organs and others are through the soil. For example, the diffusion of CO2 and O2 from the atmosphere enter into the plants is principally through stomata. On the other hand, water and ions of simple inorganic salts pass into the plants through the root cells from the soil.
(Source) - The loss of water from leaves and other aerial parts (transpiration) into the atmosphere is also accomplished by diffusion. O2 evolved in photosynthesis and the respiratory CO2 also diffuse out of the plant into the atmosphere.
- The large particles slow the rate of diffusion. The greater the difference in concentration the greater the rate of diffusion. This difference is known as the concentration gradient. A gradient is the change in the value of quantity like change in concentration, temperature to another variable. A change in concentration over a distance is called concentration gradient.
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