Cell transport

Question 1

What is Osmosis

Answer 1

the diffusion of water across a partially permeable membrane from a dilute solution (high concentration of water) to a concentrated solution (low concentration of water).

Question 2

What is Active Transport

Answer 2

This is the net movement of particles against a concentration gradient, and so energy is required

Question 3

What is Diffusion

Answer 3

Diffusion is the net movement of particles from an area of high concentration to an area of lower concentration

Question 4

List the 4 factors that affect Diffusion

Answer 4

Membrane Surface Area, Temperature, Distance & Concentration Gradient

Question 5

How does Membrane Surface Area affect the rate of diffusion?

Answer 5

The larger the surface area of the membrane that a substance is diffusing through (e.g. the membrane around a cell), the faster the rate of diffusion.

Question 6

How does Temperature affect the rate of diffusion?

Answer 6

The higher the temperature, the higher the rate of diffusion

Question 7

How does Distance affect the rate of diffusion?

Answer 7

The greater the distance a substance has to diffuse across, the more time taken.
For example, a thicker membrane creates a larger distance, so diffusion across it will take longer.

Question 8

How does Concentration Gradient affect the rate of diffusion?

Answer 8

The bigger the difference in concentration between two areas, the greater the concentration gradient and the faster the rate of diffusion.