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The cell wall is composed of two thin overlapping shells which fit together like a soap case in

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The cell wall is composed of two thin overlapping shells which fit together like a soap case in
A. desmids
B. Diatoms and dinofiagellates
C. dinoflagellates
D. slime moulds.
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The body of diatoms is covered by a transparent siliceous shell (silica deposited in cell wall) known as frustule. The frustule is made of two valves, epitheca and hypotheca. The two valves fit together like a soap box.
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