In simple diffusion, molecules move from an area of
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concentration to an area of
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concentration.
The correct answer and Explanation is :
In simple diffusion, molecules move from an area of high concentration to an area of low concentration.
Explanation:
Simple diffusion is a passive process that doesn’t require energy. It occurs when molecules move down their concentration gradient, which means they move from an area where they are more concentrated to an area where they are less concentrated. This movement continues until the concentrations are equal on both sides, reaching equilibrium.
For example, imagine a bottle of perfume opened in one corner of a room. Initially, the concentration of perfume molecules is high near the bottle. Over time, these molecules spread out through the air, moving from the high concentration near the bottle to areas with low concentration, eventually diffusing throughout the room.
Key factors that influence simple diffusion include:
- Concentration Gradient: The difference in concentration between two areas. The greater the difference, the faster the rate of diffusion.
- Temperature: Higher temperatures provide molecules with more energy, causing them to move faster and increasing the rate of diffusion.
- Molecular Size: Smaller molecules diffuse faster than larger ones due to their ability to move more freely through the medium.
- Medium of Diffusion: Diffusion occurs faster in gases compared to liquids and solids because molecules in gases have more space to move freely.
Diffusion is crucial in biological systems. For instance, oxygen and carbon dioxide diffuse across cell membranes in the lungs and tissues. Oxygen, present at higher concentrations in the lungs, diffuses into the blood, while carbon dioxide moves from the blood (high concentration) to the lungs (low concentration) to be exhaled. This exchange helps maintain cellular respiration, a vital process for energy production in living organisms.