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Practice question

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Question

A bacterium belonging to cocci group has a diameter of 2 μm. The numerical value of the ratio of its surface area to volume (in μm ⁻¹ ) is ________

Explanation

For a sphere, surface area to volume ratio equals 3/r. With diameter 2 μm, radius 1 μm gives ratio 3 μm⁻¹. This geometric relationship explains why smaller cells have higher exchange efficiency per volume.

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