SA:V

Question 1

How are alveoli adapted for exchange?

Answer 1

The alveoli have an enormous surface area and a very rich blood supply for gas exchange

Question 2

How are stomata adapted for exchange?

Answer 2

Stomata help to provide a big surface area and maintain a steep concentration gradient for the diffusion of substances such as water, mineral ions and carbon dioxide

Question 3

How do plants use active transport?

Answer 3

Plants use active transport to move mineral ions from the soil into the roots against a concentration gradient

Question 4

what is the relationship between SA:V

Answer 4

As living organisms get bigger and more complex their surface to volume ratio gets smaller.

Question 5

What happens if the living organism gets bigger?

Answer 5

This makes it increasingy difficult to exchange materials quickly enough with the outside world

Question 6

Examples of difficult exchange for living organisms with a small SA: V ratio

Answer 6

• Gases and food molecules can no longer reach every cell inside the organism by simple diffusion
• Metabolic waste can not be removed fast enough to avoid posining the cells.