Are diatoms multicellular or unicellular


Algae is a collective term for marine plants, which are monocellular or multicellular aquatic plants. They resemble highly developed plants, but they are relatively simply built. In addition, they have no roots, shoot axes or leaves and differ from higher plants in that they can absorb nutrients over their entire surface and are much more simply built. A general distinction must be made between micro and macro algae.

Microalgae: Microalgae include all types of algae that are not easily recognizable with the naked eye. They are microscopic plant organisms. They can be single-celled to multicellular. They belong to the phytoplankton.

Macroalgae: Macroalgae are all multicellular types of algae that can be seen with the naked eye. They include, for example, many green, red and brown algae.

Subgroups of algae:

  1. Green algae
  2. Diatoms
  3. Brown algae
  4. Red algae

Green algae:

© Rainer Borcherding


  • photosynthesis The process in which inorganic substances are built up into organic substances with the help of light as an energy carrier. operating living beings
  • mainly found in sea and freshwater waters
  • can settle on stones or water plants
  • many species require pure, hardly polluted water

  • Brown algae:

    © Rainer Borcherding

    Red algae:

    © Edith Friday
    • mostly marine, red algae
    • stained red by phycobiliproteins
    • occur in coastal regions of the seas, some species in fresh water