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Kingdom Protista (Protozoa)

ProtozoaThe Kingdom Protista includes mostly unicellular eukaryotes such as protistan algae, Slimemoulds and Protozoans.
On evolutionary point of view this kingdom acts as as a connecting link between prokaryotic monera and multicellular eukaryotic kingdom.(fungi, plant and  animals)

Examples: Euglena, Paramecium , Gonyaulax,
Diatoms, Amoeba, Entamoeba

General Characters:
Euglena like protists show a double life; auto trophic and heterotrophic.
Many of the protists are photosynthetic autotrophs found mainly in fresh water and oceans. They are called phytoplankton e.g. diatoms.

Structure: Mostly unicellular and posses typical cell organelles like nucleus, mitochondria, endoplasmic reticulum (ER), Golgi bodies and plastids.

Locomotion:  Some of them have cilia or flagella with 9+2 internal microtubular structure.

Reproduction: Asexual Methods (Binary Fission, Multiple fission, budding and spore formation) and Sexual methods.

Major groups of Protists
1. Photosynthetic Protists
         Examples: Dinoflagellates, Diatoms and Euglenoids)

2. Slime moulds
  • Cellular ( Dictyostelium)
  •   Acellular (Physarella and Physarum)
3. Protozoan Protists
  • Zooflagellates (Trypanosoma, Leishmania, Trichomonas, Trichonympha)
  • Amoebae (Amoeba, Entamoeba)
  • Sarcodines (Radiolarians and Foraminiferans)
  • Ciliates (Paramecium, Opalina, Vorticella)
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