A student measured the diameter of a cross-section of a plant stem and found that the xylem vessels occupied a total cross-sectional area of $12 \ mm^2$ out of a total stem area of $80 \ mm^2$. What percentage of the stem's cross-sectional area is occupied by xylem vessels?

Question

Accepted Answer

15.0%. Percentage = (xylem area ÷ total area) × 100 = (12 ÷ 80) × 100 = 15.0%. Option A results from dividing 80 by 12 incorrectly, while options B and D are common arithmetic errors. The correct calculation gives exactly 15.0%.

Answer

A) 6.7%

Answer

B) 12.0%

Answer

C) 15.0%

Answer

D) 18.5%

A student measured the diameter of a cross-section of a plant stem and found that the xylem vessels occupied a total cross-sectional area of $12 \ mm^2$ out of a total stem area of $80 \ mm^2$. What percentage of the stem's cross-sectional area is occupied by xylem vessels?

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