Diatoms do not readily decay due to

Siliceous wall

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Mucilaginous wall

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Waterproof cell wall

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Non-living cells

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Solution

The correct option is A Siliceous wall
Cell wall of diatoms is made up two layers- Inner layer is made up of pectin and encloses protoplast. Outer layer is made up of silica and it contains two halves and fixed together. Diatoms do not easily decay due to their siliceous cell wall.
Thus, the correct answer is option (A).

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