Chapter 1 Diffusion Osmosis And Active Tramsport

Question 1

What is the definition of diffusion

Answer 1

The gradual movement of. Particles from high concentration to a low concentration

Question 2

What states does diffusion occur

Answer 2

Gases and liquids because particles are free to move around

Question 3

What is the definition of osmosis

Answer 3

Osmosis is the net movement of water molecules across a partially permeable membrane from a region of high concentration to a region of low concentration

Question 4

Give an example of osmosis

Answer 4

Sponge water goes into the sponge through the holes in the surface becuase to start with the sponge has a low concentration of water

Question 5

What is the definition of active transport

Answer 5

Active transport is the movement of particles across a membrane against a concentration gradient using energy from respiration

Question 6

Give an example of active transport in the body

Answer 6

When there is a lower concentration of nutrients in the gut than in the blood the nutrients can be passed into the blood to stop us from starving even though the gradient is the opposite way

Question 7

How can substances move in and out of cells

Answer 7

Osmosis diffusion and active transport

Question 8

How do you investigate osmosis

Answer 8

Using the potato in different concentrations of sucrose to mesaure weight at start and end to see which level of sucrose caused the biggest change in mass of potato