3.3.1

Question 1

Relationship between size of organism and SA:V

Answer 1

Smaller organisms have a higher SA:V than larger organisms

Question 2

SA

V

Answer 2

Side x faces

Side x side x side

Question 3

Relationship between SA:V and metabolic rate

Answer 3

Rate of heat loss increases as SA:V increases

So they need to have a higher metabolic rate/faster respiration

To generate enough heat to maintain a constant body temperature

Question 4

Adaptations to facilitate exchange

Answer 4

Larger organisms need a specialised surface/organ for gaseous exchange and

As they have a smaller SA:V and a long diffusion pathway

Have a high demand for oxygen and to remove CO2