Year 11

# Diffusion and exchange surfaces

Define diffusion and describe the factors affecting it. Explain how diffusion is affected by surface area to volume ratio and relate this to examples of exchange over surfaces in organisms.

Year 11

# Diffusion and exchange surfaces

Define diffusion and describe the factors affecting it. Explain how diffusion is affected by surface area to volume ratio and relate this to examples of exchange over surfaces in organisms.

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## Lesson details

### Key learning points

- Describe how substances move in and out of cells by diffusion
- Explain factors that can affect the rate of diffusion
- Calculate surface area to volume ratios
- Explain adaptations for exchange

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### 6 Questions

Q1.

How would the ratio between 3 and 5 be correctly written?

3-5

3,5

3;5

Q2.

In which two states of matter are particles free to move?

solid

Q3.

Calculate the surface area of a cube with a side length of 1 cm.

1 cm2

1 cm3

6 cm3

Q4.

Calculate the volume of a cube with a side length of 1 cm.

1 cm2

6 cm2

6 cm3

Q5.

is a gas that is inhaled in the gas exchange system, where it then moves into the blood.

Q6.

Substances move into and out of through the cell membrane.

### 6 Questions

Q1.

Diffusion is the net movement of particles from an area of high to an area of low .

Q2.

Which of these is an example of diffusion?

electricity moving through a wire

heat moving through a metal rod

Q3.

Diffusion happens quicker at higher temperatures because particles have more energy.

Q4.

Match the adaptation of alveoli to the explanation.

increases surface area

short diffusion distance

increases concentration gradient

Q5.

Calculate the surface area to volume ratio of a cube with a side length of 10 cm. Give your answer as a decimal and do not include units.

Q6.

Which two of the following are leaf adaptations for diffusion?

have folded structure