Of all shapes, the one with the smallest surface area-to-volume ratio is:
AA solid cube
BA round sphere
CA long thin rod
DA flat wide disc
Answer & Solution
Correct answer: B. A round sphere
1. The question is which shape encloses a given volume with the least surface.
2. A sphere is the shape with the smallest surface area-to-volume ratio.
3. That is why a spherical cell is the worst shape for rapid exchange.
4. Rods and discs both expose more surface for the same volume.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 4 'Cell Structure', sections 4.1-4.6_
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