Question

This is the common name for photosynthetic protists that occur in unicellular, colonial and multicellular form; many of their names are derived from the pigments that they carry in their cells.

Answer 1

This state is talking about Algae.

Indeed, the algae can be classified according to their pigmentation. In the broadest sense of the term, algae gather:

* Prokaryotic organisms: Cyanobacteria (formerly called "blue-green algae" or Cyanophyceae);

* Eukaryotes:

-various groups with unicellular species (Euglenophytes, Cryptophytes, Haptophytes, Glaucophytes, etc.),

-other groups with unicellular or multicellular species:

   "red algae" or Rhodophyta,

   Stramenopiles (including diatoms and "brown algae" or Phéophycées),

-and finally, plants quite close to terrestrial plants: "green algae", which include, among others, Ulvophyceae.