What is true of bacillariophyceae?

Epitheca is smaller.

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Hypotheca is smaller.

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Both epitheca and hypotheca have same size.

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Any of the two can be larger.

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Solution

The correct option is B Hypotheca is smaller.
The diatoms (belong to Bacillariophyceae) have an external hard and porous layer called frustules.
These frustules are composed of two sections (also called valves or thecae).
The smaller thecae are called as hypotheceae.
The correct answer is B.

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