A1.5 - Diffusion, Osmosis and Active Transport

Which statement correctly describes diffusion?

Osmosis differs from diffusion because osmosis

Which process is most likely used by root hair cells to take up nitrate ions when soil nitrate level is low?

Diffusion is the net movement of particles from

Which process involves the movement of water molecules through a partially permeable membrane?

A partially permeable membrane allows

Active transport requires

Which is most likely to diffuse fastest?

When particles are evenly spread out, the system is at

Which statement is TRUE?

A drop of food dye spreads faster in warm water than in cold water because

A potato strip placed in distilled water becomes firmer because water moves into cells by

Saltfish becomes less salty after soaking mainly because salt particles

Which change would increase the rate of diffusion across a membrane?

Root hair cells take up nitrate ions even when soil nitrate concentration is low. This suggests

A dialysis tubing setup contains starch + glucose inside and iodine solution outside. After a while, the inside turns blue-black. This shows

Which pair correctly matches a process with its direction?

Two solutions are separated by a partially permeable membrane. Side X is more dilute than Side Y. What is the net movement of water?

A student claims: 'Osmosis is the movement of solute particles through a membrane.' What is the best correction?

A leaf cell is placed in very salty water. Which sequence is most likely?

Which best explains why active transport stops when a cell is poisoned and cannot respire?

A student repeats the dye diffusion experiment but gently stirs the water. What is the best statement?

In the dialysis tubing investigation, glucose is detected outside but starch is not. The best conclusion is

A sports drink is more concentrated than blood plasma. If a person drinks large amounts quickly, what is the immediate osmosis effect on gut cells?