LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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active transport √diffusion √osmosis √
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active transport √diffusion √osmosis X
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active transport √diffusion Xosmosis √
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active transport Xdiffusion √osmosis √
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Detailed explanation-1: -Answer and Explanation: E. Active transport could only occur through the plasma membrane of a living cell.
Detailed explanation-2: -Particles move across membranes by simple diffusion, facilitated diffusion, osmosis and active transport.
Detailed explanation-3: -The simplest mechanism by which molecules can cross the plasma membrane is passive diffusion. During passive diffusion, a molecule simply dissolves in the phospholipid bilayer, diffuses across it, and then dissolves in the aqueous solution at the other side of the membrane.
Detailed explanation-4: -Active transport in plants For plants to take up mineral ions, ions are moved into root hairs, where they are in a higher concentration than in the dilute solutions in the soil. Active transport then occurs across the root so that the plant takes in the ions it needs from the soil around it.