Multiple Choice Questions 1. What is osmosis? a) Movement of particles from an area of higher concentration to an ar b. b) Movement of particles against a concentration gradient c. c) Diffusion of water across a selectively permeable membrane d. d) Movement-of oxygen into cells 2. Which of the following substances enter and leave cells by diffusion? a. a) Oxygen b. b) Carbon dioxide c. c) Glucose d. d) All of the above 3. What happens to a plant cell when it loses water by osmosis? a. a) It becomes turgid b. b) It bursts c. c) It wilts d. d) It remains unchanged What is diffusion? a. a) Movement of particles from an area of lower concentration t b. b) Movement of particles from an area of higher concentration c. c) Movement of water across a selectively permeable membrar d. d) Movement of particles against a concentration gradient at is the concentration gradient? a. a) The movement of particles from an area of lower concent b. b) The difference in concentration between two areas c) The movement of water across a selectively permeable r d) The process of particles moving against a concentratior

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Multiple Choice Questions 1. What is osmosis? a) Movement of particles from an area of higher concentration to an ar b. b) Movement of particles against a concentration gradient c. c) Diffusion of water across a selectively permeable membrane d. d) Movement-of oxygen into cells 2. Which of the following substances enter and leave cells by diffusion? a. a) Oxygen b. b) Carbon dioxide c. c) Glucose d. d) All of the above 3. What happens to a plant cell when it loses water by osmosis? a. a) It becomes turgid b. b) It bursts c. c) It wilts d. d) It remains unchanged What is diffusion? a. a) Movement of particles from an area of lower concentration t b. b) Movement of particles from an area of higher concentration c. c) Movement of water across a selectively permeable membrar d. d) Movement of particles against a concentration gradient at is the concentration gradient? a. a) The movement of particles from an area of lower concent b. b) The difference in concentration between two areas c) The movement of water across a selectively permeable r d) The process of particles moving against a concentratior

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1. **c) Diffusion of water across a selectively permeable membrane** Osmosis is specifically the movement of water, not just any particle. 2. **d) All of the above** Oxygen and carbon dioxide are small, nonpolar molecules that readily diffuse across cell membranes. While glucose *can* move by facilitated diffusion, it's important to note that it often requires protein channels and isn't simple diffusion like the gases. The question, however, implies all these substances *can* enter/leave by diffusion, which is true. 3. **c) It wilts** Loss of water causes the plant cell to lose turgor pressure, leading to wilting. 4. **b) Movement of particles from an area of higher concentration to an area of lower concentration** Diffusion is the passive movement of particles down a concentration gradient. 5. **b) The difference in concentration between two areas** The concentration gradient is what drives diffusion. It represents the difference in the amount of a substance in two different locations.

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