LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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water moves from high to low water potential across a partially permeable membrane
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large or oddly shaped molecules move across a cell membrane
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water moves when energy is used
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proteins are built
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Detailed explanation-1: -Osmosis is a special type of diffusion, namely the diffusion of water across a semipermeable membrane. Water readily crosses a membrane down its potential gradient from high to low potential (Fig. 19.3) [4]. Osmotic pressure is the force required to prevent water movement across the semipermeable membrane.
Detailed explanation-2: -Osmosis is the movement of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.
Detailed explanation-3: -The water always moves from the region of higher water potential to the region of lower water potential. So the rate of osmosis is directly proportional to the water potential. If a solution has high water potential (low solute concentration) then osmosis will take place.
Detailed explanation-4: -In biology, osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell’s partially permeable membrane.
Detailed explanation-5: -Osmosis is the diffusion of water molecules, from a region where they are in higher concentration, to a region where they are in lower concentration, through a partially permeable membrane.