gas exchange exam questions

Question 1

explain the advantage for larger organisms of having a gas exchange system that facilitates oxygen uptake

Answer 1

-larger organisms have smaller surface area to volume ratio
-overcomes short diffusion pathway.

Question 2

Suggest how the environmental conditions have resulted in adaptations of systems using Model A rather than Model B.
___________________________________________________________ (2)

Answer 2

-lower partial pressure in water than air
-model A gives larger surface area in contact to with water

Question 3

student who looked at these results said that they could not make a conclusion about the relationship between stage of development and metabolic rate.
Use information in the table to explain reasons why they were unable to make a conclusion.
__________________________________________________________

Answer 3

-no info for egg
-so cannot compare all stages
-no standard deviation/ do not know if there is a significant difference.

Question 4

Sunflowers are not xerophytic plants. The scientists repeated the experiment with xerophytic plants.
Suggest and explain one way the leaf growth of xerophytic plants would be different from the leaf growth of sunflowers in Figure 2.
___________________________________________________________ (2)

Answer 4

-slower growth
-fwer number of stomata