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Osmosis is best defined as:

A. the diffusion of gas across a semi-permeable membrane
B. the diffusion of water across an impermeable membrane
C. the diffusion of gas across an impermeable membrane
D. the diffusion of water across a semi-permeable membrane

Answer :

Final answer:

Osmosis is the movement of water through a semipermeable membrane from regions of low to high solute concentration. It is essential for maintaining cellular functions and fluid balance. Understanding osmosis is crucial in biology.


Explanation:

Osmosis: Definition and Process

Osmosis is defined as the diffusion of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. This process is critical in biological systems as it helps maintain cell turgor and overall fluid balance.

The semipermeable membrane allows water molecules to pass through while restricting the movement of larger molecules or ions, such as sodium (Na+) or chlorine (Cl-). For instance, when a cell is placed in a hypotonic solution (lower solute concentration outside the cell), water enters the cell, potentially causing it to swell. Conversely, in a hypertonic solution (higher solute concentration outside), water leaves the cell, which may lead to cell shrinkage.

In summary, the process of osmosis is vital for understanding how cells interact with their environment and regulate their internal conditions.


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