Kingdom Protista
🌍 General Characteristics
- Eukaryotic organisms
- Mostly unicellular, some multicellular (algae)
- Primarily aquatic organisms
- Show both autotrophic and heterotrophic nutrition
- Reproduce both sexually and asexually
🦠 Protozoa (Animal-like Protists)
Examples:
- Amoeba - moves using pseudopodia
- Paramecium - uses cilia for movement
- Plasmodium - causes malaria
- Euglena - mixotrophic (both plant and animal characteristics)
🌿 Algae (Plant-like Protists)
Examples:
- Chlamydomonas - unicellular green algae
- Spirogyra - filamentous green algae
- Diatoms - golden algae with silica shells
- Volvox - colonial green algae
🍄 Slime Molds (Fungus-like Protists)
Examples:
- Physarum polycephalum - yellow slime mold
- Dictyostelium - cellular slime mold
📊 Classification Table
| Type | Nutrition | Locomotion | Importance |
|---|---|---|---|
| Protozoa | Heterotrophic | Pseudopodia/Cilia/Flagella | Disease causing, ecological balance |
| Algae | Autotrophic | Flagella/Buoyancy | Oxygen production, food source |
| Slime Molds | Saprophytic | Pseudopodia | Decomposers, research models |
💡 Key Points
- Called "junk drawer" kingdom due to diversity
- Important primary producers in aquatic ecosystems
- Form symbiotic relationships (e.g., zooxanthellae in corals)
- Some cause diseases: Malaria, Giardiasis, Toxoplasmosis
