Cell wall of diatom consists of

Silica only

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Pectic substances

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Both A and B

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None of the above

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Solution

The correct option is B Both A and B
Diatoms are algae with distinctive, transparent cell walls made of silicon dioxide hydrated with a small amount of water. Silica is the main component of glass and hydrated silica is very like the mineral opal, making these algae, often called as "algae in glass houses" more like "algae in opal houses". The cell wall of diatom is called as frustule.
Thus, the correct answer is option C.

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