A bacterium belonging to cocci group has a diameter of 2

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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 ______

1. 0
2. 1
3. 2
4. 3

Correct Option: D

Gram-positive anaerobic cocci (GPAC) are a heterogeneous group of organisms defined by their morphological appearance which are spherical-shaped bacterium.
Given, diameter of the cocci = 2µm
Therefore, radius = 1µm
Hence, surface area : volume of the cocci = 4πr² / (4 / 3πr³) = 3 / r = 3 µm