Biconcave vs Biconvex: Which Gives Greater Surface Area?

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Pranav Jha
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this question of mine springs from an observation in biology but i think the answer is explained by physics. Both RBCs and chloroplasts need to have large surface area but RBC is biconcave shaped whereas chloroplast is biconvex shaped. IF both had the same volume, which would have a greater surface area i.e. for a given volume, which shape, biconcave or biconvex, gives greater surface area?
 

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Biconcave would have the greater surface area.