Diffusion

What effect does an increase in temperature have on diffusion?

• An increase in temperature slows down diffusion.

• An increase in temperature has no effect on diffusion.

• An increase in temperature speeds up diffusion.

• An increase in temperature causes diffusion to stop.

Define concentration gradient.

• A concentration gradient is the difference in the concentration of a substance between two areas.

• A concentration gradient is the uniform distribution of a substance across a space.

• A concentration gradient is the process of mixing two substances evenly.

• A concentration gradient is the increase in temperature of a substance in a given area.

What factors affect the rate of diffusion?

• Temperature, concentration gradient, and size of the particles.

• Pressure, humidity, and light intensity.

• Color, shape, and texture of the particles.

• Volume, mass, and density of the particles.

What is the role of the cell membrane in diffusion?

• The cell membrane allows all substances to pass freely.

• The cell membrane controls the movement of substances in and out of the cell.

• The cell membrane prevents any movement of substances.

• The cell membrane only allows water to pass through.

What is active transport?

• The movement of particles with the concentration gradient, requiring no energy.

• The movement of particles against a concentration gradient, requiring energy.

• The passive movement of water across a membrane.

• The movement of particles in and out of the cell without energy.

What is osmosis?

• The movement of solutes from high to low concentration.

• The diffusion of water across a selectively permeable membrane.

• The process of active transport in cells.

• The absorption of nutrients through the digestive system.

True or False: Diffusion occurs only in solids.

• True

• False

• Only in liquids

• Only in gases

What is an example of diffusion?

• The spreading of perfume in a room.

• The movement of water through a membrane.

• The process of photosynthesis in plants.

• The circulation of blood in the body.

What is isotonic solution?

• A solution with a higher concentration of solutes outside the cell than inside.

• A solution with a lower concentration of solutes outside the cell than inside.

• A solution where the concentration of solutes is the same inside and outside the cell.

• A solution that causes cells to swell and burst.

What happens to cells in a hypertonic solution?

• Cells gain water and may swell.

• Cells lose water and may shrink in a hypertonic solution.

• Cells remain unchanged in a hypertonic solution.

• Cells burst due to excess water intake.