Diffusion

Question 1

What is the concentration gradient?

Answer 1

Look at chegg diagram

Question 2

Rates of diffusion:

Which pair would have the highest rates of diffusion and why?

High/low temperature

Answer 2

High temp. because the molecules would have more kinetic energy and collide more often therefore diffusing quicker

Question 3

What is diffusion?

Answer 3

Diffusion is the net movement of molecules from a region of their higher concentration to a region of their lower concentration, down a concentration gradient.

Question 4

Rates of diffusion:

Which pair would have the highest rates of diffusion and why?

Big/small concentration difference

Answer 4

The more concentrated the particles are in original area, the more likely they are to bump into each other + the steeper the concentration gradient the higher the rate of diffusion. (Big concentration difference)

Question 5

Rates of diffusion:

Which pair would have the highest rates of diffusion and why?

Large/small membrane surface area

Answer 5

The greater the surface of the cell membrane the quicker diffusion will occur. Also the thinner the membrane the faster diffusion will happen.

Question 6

What does diffusion only occur in out of:

Solids/Liquids/Gas

Answer 6

Liquids and gases

Question 7

When do particles stop diffusing?

Answer 7

Until the particles are evenly spread + no concentration gradient

Question 8

What is active transport?

Chegg diagram

Answer 8

Active transport is the movement of molecules/ions through the cell membrane against a concentration gradient, using energy released during respiration

Needs lots of mitochondria

Question 9

What is passive transport?

Answer 9

When molecules move down the concentration gradient and no energy is required

Question 10

Give an example of when a plant uses active transport

Chegg diagram

Answer 10

When root hair cells absorb ions or nutrients such as magnesium ions