An aquatic microscopic organism is photosynthetic, floats passively with plankton and possesses indestructible silica-co
The organism is a diatom, a photosynthetic chrysophyte that forms part of the plankton. Diatoms are described as the chief producers in oceans, and their accumulated silica-rich walls form diatomaceous earth.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Protista - Chrysophytes and Dinoflagellates