exam questions

Question 1

how does an organisms surface area to volume ratio relate to its metabolic rate ?

Answer 1

the smaller the surface area to volume ratio the higher the metabolic rate

Question 2

How might a large organism adapt to compensate for it’s small surface area :volume ratio?

Answer 2

changes that increase the surface area : e.g., folding

Question 3

why do multicellular organisms require specialised gas exchange surfaces ?

Answer 3

Their smaller surface area :volume ratio means that the distance that needs to be crossed is larger and substances cannot easily enter as they would in a single celled organisms

Question 4

name 3 features of an efficient gas exchange surface?

Answer 4

1.large SA
2.Thin/short distance
3.steep concentration gradient ,Maintained by blood supply or ventilation

Question 5

why can’t insects use their bodies as exchange surfaces ?

Answer 5

they have a water proof chitin exoskeleton and a small surface area to volume ratio in order to conserve water