Diffusion/Osmosis

What is the primary driving force behind the movement of molecules in both osmosis and diffusion?

•  Active transport

• Energy consumption

• Concentration gradient

  
  

• Osmotic pressure

 In osmosis, water molecules move across a semi-permeable membrane from an area of ______ concentration to an area of ______ concentration.

•  Lower, lower

• Higher, lower

• Lower, higher

• Higher, higher

How does osmosis differ from diffusion?

• Diffusion involves the movement of water molecules only.

• Osmosis requires energy input.

• Diffusion occurs through a semi-permeable membrane.

• Osmosis involves the movement of water molecules only.

If a raisin is placed in salt water, and its volume decreases, which process is at play?

• Diffusion

• Osmosis

Which of the following best describes diffusion?

• Movement of water across a membrane

• Movement of molecules from an area of lower concentration to an area of higher concentration

• Random movement of molecules from an area of higher concentration to an area of lower concentration

• Active transport of ions across a membrane