Home Biology Biological Classification All Topic Question For Revision Test Diatoms pile up at the bottom of water reser…
Biology Biological Classification All Topic Question For Revision Test Single Correct MCQ
Published on: August 21, 2026

Diatoms pile up at the bottom of water reservoirs and form big heaps as -

A
They have chlorophyll a,c
B
The cell walls form two thin overlapping shells
C
They float passively in water currents
D
Their walls are embedded with silica

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The correct answer is:
D

Diatoms have cell walls composed of two thin overlapping shells that fit together like a soapbox. These walls are impregnated with silica (transparent, opaline silica), which makes them indestructible and resistant to decay. When diatoms die, their siliceous cell walls (frustules) do not decompose, but rather pile up at the bottom of water reservoirs (oceans and lakes), accumulating over millions of years to form massive deposits known as diatomaceous earth or diatomite.

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