alleryA photosynthetic plankton has two overlapping silica shells. It is most likely a:
ADiatom
BSlime mould
CEuglenoid
DFlagellated protozoan
Answer & Solution
Correct answer: A. Diatom
Diatoms are chrysophytes with overlapping, silica-embedded cell-wall shells. Their accumulated walls form diatomaceous earth. Chrysophytes include diatoms and desmids, and most are photosynthetic plankton.
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