BIOLOGY PROJECT
PROTOCTISTS
KINGDOM
Made By – Agney Dhanapune 9 th A
What is a protoctist kingdom ?
◦ The protoctist kingdom, often referred to as the Kingdom Protista or Protists, is a diverse group
of eukaryotic microorganisms that do not fit neatly into the other kingdoms of life such as
plants, animals, or fungi. Characteristics of Protoctists:
◦ Eukaryotic Cells: Protoctists are primarily unicellular or simple multicellular organisms with
eukaryotic cells, meaning they have a nucleus enclosed within membranes and organelles.
◦ Diverse Forms: They exhibit a wide range of forms and lifestyles. Some are similar to animals
(protozoa), some resemble plants (algae), and some share characteristics with fungi (slime
molds and water molds). Various Modes of Nutrition:Autotrophic: Some protoctists, like algae,
can produce their own food through photosynthesis.
◦ Heterotrophic: Others, like many protozoa, ingest or absorb organic matter.
◦ Mixotrophic: A few can switch between autotrophic and heterotrophic modes of nutrition
depending on environmental conditions.
Characteristics and Features of
protoctists kingdom ?
 They are multicellular or unicellular.
 Their cells have a nucleus and may or may not have a cell wall and chloroplasts.
 Autotrops – They feed by photosynthesis.
 Heterotrops – They feed by organic matter or organic substances made by other organisms.
◦
Classification:
◦ The protoctists are often subdivided into several major groups based on their similarities to other kingdoms:
◦ Protozoa: Animal-like protists, usually motile and heterotrophic. Examples include:
◦ Amoeboids (e.g., Amoeba)
◦ Flagellates (e.g., Trypanosoma)
◦ Ciliates (e.g., Paramecium)
◦ Sporozoans (e.g., Plasmodium)
◦ Algae: Plant-like protists that are typically photosynthetic and can be unicellular or multicellular. Examples
include:
◦ Green Algae (e.g., Chlamydomonas)
◦ Brown Algae (e.g., kelp)
◦ Red Algae (e.g., Porphyra)
◦ Slime Molds: Fungus-like protists that have a life cycle with a motile, amoeba-like stage. They are often found in
decaying organic matter.)
Examples and videos on protoctists
kingdom
THANK YOU !