7.1 Specialised exchange surfaces

Question 1

diffusion alone is enough for single celled organisms

Answer 1

• the metabloic demand of single celled organisms is low enough to demand for o2 is low enough
• the SA to VOl ratio is large

Question 2

an elephant has a …. surface area to vol ratio

Answer 2

small

Question 3

single celled organism has a ….. sa to vol ratio

Answer 3

large