If an earthworm is left in 40 % KOH solution for a long time, which part would be left undissolved?

Setae

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Spermatheca

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Sand particles

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Circular muscles

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Solution

The correct option is C Setae
Setae are the chitinous bristles made up of nitrogenous organic substance so it cannot dissolve in alkaline solution. Spermatheca, sand particles, and circular muscles are majorly made up of proteins which is a zwitter ions and can easily dissolve in alkaline solution.
So, the correct answer is option D.

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