Diffusion and Factors Affecting Rate

What is diffusion?

• The movement of particles from an area of higher concentration to an area of lower concentration

• The random movement of particles

• The spreading out of particles due to chance

• The process of particles choosing to go to areas of lower concentration

Where does diffusion take place?

• Only in gases

• Only in solutions

• Only through cell membranes

• In both gases and solutions

What type of molecules can diffuse through partially permeable membranes?

• Large molecules like starch and proteins

• Small molecules like glucose and water

• Both large and small molecules

• None of the above

What is the concentration gradient?

• The movement of particles from an area of lower concentration to an area of higher concentration

• The difference in concentration between two areas

• The random movement of particles

• The process of particles spreading out due to chance

How does temperature affect the rate of diffusion?

• Higher temperature increases the rate of diffusion

• Lower temperature increases the rate of diffusion

• Temperature has no effect on the rate of diffusion

• Temperature affects the direction of diffusion

What is the role of surface area in diffusion?

• Surface area has no effect on diffusion

• Larger surface area increases the rate of diffusion

• Smaller surface area increases the rate of diffusion

• Surface area affects the direction of diffusion

What are the high concentration areas in the example of blood vessels and cells?

• Blood vessels

• Cells

• Both blood vessels and cells

• None of the above

What substances diffuse into the cells in the example of blood vessels and cells?

• Glucose and oxygen

• Carbon dioxide

• Both glucose and oxygen, and carbon dioxide

• None of the above

What is one of the waste products of cellular respiration?

• Glucose

• Oxygen

• Carbon dioxide

• Water

How is the concentration gradient maintained in the example of blood vessels and cells?

• By diffusion of glucose and oxygen into the cells

• By diffusion of carbon dioxide out of the cells

• By the continuous removal of carbon dioxide by the blood

• By the continuous supply of glucose and oxygen by the blood