Topic 1b - transport in cells ( 4. exchange surfaces )

Question 1

As living organisms get larger and more complex, their surface area to volume ratio

Answer 1

decreases

Question 2

What does a decrease in surface area to volume ratio make it more difficult to do?

Answer 2

Exchange of important substances

Question 3

Why can larger organisms no longer rely on diffusion of oxygen?

Answer 3

As it will not reach cells deep within the body

Question 4

What are there in larger organisms to aid the exchange of substances?

Answer 4

Surfaces adapted to effective exchange

Question 5

Where are exchange surfaces found?

Answer 5

In plants and animals

Question 6

What are the features that maximise the effectiveness of an exchange surface?

Answer 6

Large surface area, thin, good blood supply, ventilated

Question 7

How does a thin exchange surface increase the rate at which materials are exchanged?

Answer 7

It means there is less distance for the substance to travel through the surface