Refer to the figure.

- The figure shows the relationship between the trunk diameter and the leaf mass of ponderosa pine trees from both moist and desert climates. According to the figure, a tree in a desert climate with a trunk diameter of 30 cm would have about _______ leaf mass of a tree with a trunk diameter of 10 cm. (Note the log-log scale.)
A) 2 times less
B) 4 times less
C) 8 times more
D) 20 times more

Question

Refer to the figure.

- The figure shows the relationship between the trunk diameter and the leaf mass of ponderosa pine trees from both moist and desert climates. According to the figure, a tree in a desert climate with a trunk diameter of 30 cm would have about _______ leaf mass of a tree with a trunk diameter of 10 cm. (Note the log-log scale.)
A) 2 times less 
B) 4 times less 
C) 8 times more 
D) 20 times more

Quizplus · Accepted Answer

On a log-log scale, a linear relationship indicates a power law. If the trunk diameter increases from 10 cm to 30 cm, the leaf mass increases by a factor of 3^n, where n is the slope of the line. If n is approximately 3, then the leaf mass is 8 times more.

Refer to the Figure