Protista use appendages, such as hair-like cilia or whip-like flagella for moving around.
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Whittaker’s classification of living organisms:
Whittaker proposed an elaborate five kingdom classification – Monera, Protista, Fungi, Plantae and Animalia. The main criteria of the five kingdom classification were cell structure, body organisation, mode of nutrition and reproduction, and phylogenetic relationships.
- These organisms do not have a defined nucleus or organelles, nor do any of them show multi-cellular body designs.
- On the other hand, they show diversity based on many other characteristics. Some of them have cell walls while some do not.
- Of course, having or not having a cell wall has very different effects on body design here from having or not having a cell wall in multicellular organisms.
- The mode of nutrition of organisms in this group can be either by synthesizing their own food (autotrophic) or getting it from the environment (heterotrophic).
- Examples: Bacteria, blue-green algae or cyanobacteria, and mycoplasma.
- This group includes many kinds of unicellular eukaryotic organisms.
- Some of these organisms use appendages, such as hair-like cilia or whip-like flagella for moving around.
- Their mode of nutrition can be autotrophic or heterotrophic.
- Examples: Unicellular algae, diatoms and protozoans.
- These are heterotrophic eukaryotic organisms.
- Some of them use decaying organic material as food and are therefore called saprotrophs.
- Others require a living protoplasm of a host organism for food.
- They are called
- Many of them have the capacity to become multicellular organisms at certain stages in their lives.
- They have cell walls made of a tough complex sugar called
- Examples: Yeasts, molds and mushrooms.
- Some fungal species live in permanent mutually dependent relationships with blue-green algae (or cyanobacteria).
- Such relationships are called
- These symbiotic life forms are called
- We have all seen lichens as the slow-growing large colored patches on the bark of trees.
- These are multicellular eukaryotes with cell walls.
- They are autotrophs and use chlorophyll for photosynthesis.
- Thus, all plants are included in this group.
- These include all organisms which are multicellular eukaryotes without cell walls.
- They are