1.4 Diffusion

Question 1

Name 3 factors that affect diffusion.

Answer 1

• temperature
• concentration
• surface area

Question 2

How does temperature affect diffusion?

Answer 2

The higher the temperature of the particles, the more energy they have so they move and mix faster

Question 3

How does concentration affect diffusion?

Answer 3

The steeper the concentration gradient, the quicker the rate of diffusion

Question 4

How does surface area affect diffusion?

Answer 4

The higher the surface area, the more diffusion can happen at once

Question 5

Name an adaptation that cells have that increase the rate of diffusion.

Answer 5

They have a cell membrane folded on at least one side to increase the surface area

Question 6

What determines the net movement of particles across a cell membrane?

Answer 6

The concentration on either side of the membrane

Question 7

Name 3 examples of diffusion.

Answer 7

• oxygen into the cells of the body from the bloodstream as the cells are restoring and using up oxygen
• carbon dioxide into actively photosynthesising plant cells
• simple sugars and amino acids from the gut through cell membranes

Question 8

What is diffusion?

Answer 8

The net movement of particles of a gas or a solute from an area of high concentration to an area of low concentration as a result of the random movement of particles