Question

osmosis is best defined as the movement of
multiple choice
molecules from an area of high concentration to an area of lower concentration.
molecules from an area of low concentration to an area of higher concentration.
water molecules across a membrane from an area of low water to an area of higher concentration.
water molecules across a membrane from an area of high water concentration to an area of lower concentration
water molecules inside a container.

Explanation:

Osmosis is the diffusion of water across a selectively permeable membrane. Water moves from an area of high water concentration (low solute concentration) to an area of low water concentration (high solute concentration) to equalize concentrations. Let's analyze each option:

• First option: Osmosis specifically involves water, not just any molecules (diffusion of other molecules is simple diffusion), so this is incorrect.
• Second option: Molecules (other than water in osmosis) moving from low to high concentration is active transport, not osmosis, and osmosis is about water, so this is wrong.
• Third option: Water moving from low to high water concentration is the opposite of osmosis; osmosis is high to low water concentration (or low to high solute), so this is incorrect.
• Fourth option: This matches the definition of osmosis: water molecules across a membrane from high water concentration (low solute) to low water concentration (high solute).
• Fifth option: This is too vague and doesn't describe the process of osmosis (movement across a membrane due to concentration gradients), so it's incorrect.

Answer:

The fourth option (water molecules across a membrane from an area of high water concentration to an area of lower concentration)