Question

Amphibians such as frogs breathe both with their lungs and via gas exchange through their moist skin. Which is likely to be able to derive a higher proportion (fraction) of its oxygen demand from gas exchange through their skin as opposed to via its lungs? Hint: consider which concept you need to consider to answer this question.
Select one:
a. poison dart frog (one of the smallest frogs in the world)
b. bullfrog (one of the largest frogs in the world)

Answer 1

Answer:

Option B

Explanation:

Gas exchange occurs through the skin of the frogs. The rate of gas exchange depends on several factors such as  

A) Surface area

B) Thickness of the medium

C) Difference in the concentration of the gas across the skin/surface

Of the two give options, the bull frog has larger body as compared to that of dart frog hence; its surface area will be larger among the two frog species. With larger surface area it will have higher gas exchange.

Hence, option B is correct