Movement in and out of Cells

Question 1

Diffusion

Answer 1

Diffusion is the net movement of particles from a region of their higher concentration to a region of their lower concentration down a concentration gradient, as a result of their random movement.

Question 2

Surface area

Answer 2

The larger the surface area, the higher the rate of diffusion. This is because more molecules at a given time will be diffusing.

Question 3

Temperature

Answer 3

The higher the temperature, the higher the rate of diffusion. This is because molecules are faster and have more kinetic energy with higher temperatures.

Question 4

Concentration gradients

Answer 4

The higher the concentration gradient, the higher the rate of diffusion.

Question 5

Distance

Answer 5

The shorter the distance, the higher the rate of diffusion. This is quite self-explanatory. The shorter the distance the particles have to move, the quicker the process is going to be.

Question 6

Osmosis

Answer 6

Osmosis is the net movement of water molecules from a region of high water potential (dilute solution) to a region of low water potential (concentrated solution) through a partially permeable membrane.

Question 7

Active Transport

Answer 7

Active transport is the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiration.