Define diffusion.

• Diffusion is the net movement of molecules and ions from a region of higher concentration to a region of lower concentration.

• Diffusion is the net movement of molecules and ions from a region of lower concentration to a region of higher concentration.

• Diffusion is the net movement of molecules and ions from a region of better concentration to a region of worse concentration.

• Diffusion is the net movement of molecules and ions from a region of hotter concentration to a region of colder concentration.

Which is NOT an example of diffusion?

• carbon dioxide into the air spaces of a leaf

• oxygen into an organism across a gas exchange surface

• oxygen into a cell across its cell surface membrane

• food into an organism across the lip barrier

If we increase the kinetic energy of molecules of a gas or a solution...

• the rate of diffusion will decrease

• the rate of diffusion will depreciate

• the rate of diffusion will increase

• the rate of diffusion will cease

Which is larger, a water molecule or a sugar molecule?

What is the meaning of "partially permeable" membrane?

A solution that has a high concentration of water molecules has...

• great water potential

• super water potential

• high water potential

• excellent water potential

What will happen if we put an animal cell in pure water?

• water will move out of the cell by osmosis and cell will shrivel up

• water will not move either way by osmosis and cell stays as is

• water will move into the cell by osmosis and cell will swell and burst

• water will move away by osmosis and cell will dry out and die

Which part of a plant cell is fully permeable?

• nucleus

• cytoplasm

• cell wall

• cell membrane

Which part of a cell is partially permeable?

• cell wall

• cell membrane

• chloroplast

• nucleus

What is the meaning of a "turgid" cell?

• cell is swollen and firm

• cell is sickly and weak

• cell is tiny but strong

• cell is shriveling up