Question

cell wall is impregnated with silica in ______​

Answer 1

Answer:

The body is covered by a transparent siliceous shell (silica deposited in cell wall) known as frustule. The frustule is made up of two valves, epitheca, and hypotheca.

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Answer 2

The cell wall is impregnated with silica in Diatoms.

• The cell wall of diatoms contains two thecae that are overlapping and form a parallelogram.
• This layer is composed of silica which makes the structure of diatoms hard. It is called a frustule.
• The presence of silica does not allow the exchange of molecules from outside to inside or vice-a-versa. Hence there are small pores on the frustule to facilitate this action.
• The pores are also used for the removal of waste and mucilage.
• After the death of diatoms, the silica remains to form diatomaceous earth.