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what is concentration gradient? Related: Introductory video about Osm...
The concentration of scent molecules is highest on areas of the skin that have had perfume or aftershave directly applied. Others can smell the scent because some of those molecules are always traveling away from the perfumed person, the source, out into the air—moving down the concentration gradient, from a high concentration to a lower concentration. Eventually the scent molecules are so widely dispersed that they can no longer be detected.Think about the unpleasant scent of skunk stink, when a skunk has sprayed or been struck by a vehicle. As a person gets closer to the source of the skunk stink, the scent gets stronger, because the “stink molecules” are more highly concentrated closer to the source.Molecules not only travel through air, but through other media as well. When a person puts creamer in his or her coffee, the cream molecules would eventually bounce around in the cup, moving down the concentration gradient until evenly distributed. However, most coffee drinkers do not wait for this to happen. They introduce additional energy by stirring the coffee and speeding up the process.

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what is concentration gradient? Related: Introductory video about Osm...
The simplest answer would be :
if any solution is not isotonic ,then concentration gradient will be presence of molecules in different concentrations on either side of semi permeable membrane.
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what is concentration gradient? Related: Introductory video about Osm...
Concentration Gradient
Concentration gradient refers to the difference in concentration of a substance between two regions. In the context of biology, this term is often used to describe the difference in the concentration of molecules or ions across a cell membrane.

Importance of Concentration Gradient
The concentration gradient is crucial for various biological processes such as osmosis and diffusion. It is essential for the movement of molecules and ions across cell membranes.

Osmosis and Diffusion
Osmosis is the movement of water molecules across a selectively permeable membrane from an area of higher water concentration to an area of lower water concentration. Diffusion, on the other hand, is the movement of molecules from an area of higher concentration to an area of lower concentration.

Role of Concentration Gradient in Osmosis and Diffusion
In both osmosis and diffusion, the concentration gradient plays a vital role. It is the driving force that allows molecules or ions to move from an area of higher concentration to an area of lower concentration. This movement occurs until equilibrium is reached, and the concentration is equal on both sides of the membrane.

Visual Representation
Imagine a glass of water with a drop of food coloring. Over time, the food coloring will spread evenly throughout the water due to diffusion, moving from an area of higher concentration (the drop) to lower concentration (the rest of the water). This visual representation helps to understand the concept of concentration gradient in action.
In conclusion, the concentration gradient is a fundamental concept in biology that drives the movement of molecules and ions across cell membranes through processes like osmosis and diffusion. Understanding this gradient is crucial for comprehending various biological phenomena.
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what is concentration gradient? Related: Introductory video about Osmosis and Diffusion - Class 11, Biology
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