SA:V

Question 1

as size of an organism increases

Answer 1

the SA increases and V increase - but not in same proportion

Question 2

as volume increases

Answer 2

the organism required more O2, nutrients ect

• more cells / more complex processes

Question 3

SA:V - cube

Answer 3

SA - side x side x 6

V - side x side x side

Question 4

SA:V - sphere

Answer 4

SA - 4 pi r ^2

V - 4/2 pi r ^3

Question 5

why gas systems

Answer 5

when the increase in surface area is not enough to supply the needs / requirements of the increased volume

specialised gas exchange systems are needed eg lungs, gills