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Difficulty: EasyKingdom Protista: Protozoa and Unicellular Algae

Match each unicellular protist listed on the left with its defining structural feature or locomotory organelle on the right.

  • *Amoeba*Locomotion using temporary cytoplasmic projections called pseudopodia
  • *Paramecium*Locomotion driven by tiny, hair-like projections called cilia covering the cell
  • *Euglena*Possesses a whip-like flagellum and a red photoreceptive eyespot (stigma)
  • *Plasmodium*Non-motile parasitic protozoan that reproduces via spore formation (sporozoites)

Answer

*Amoeba* matches with pseudopodia locomotion; *Paramecium* matches with cilia locomotion; *Euglena* matches with flagellum and eyespot; *Plasmodium* matches with non-motile spore-forming parasite.
Each protist taxon is accurately paired with its primary locomotory structure or biological characteristic: *Amoeba* utilizes pseudopodia, *Paramecium* uses cilia, *Euglena* possesses a flagellum with an eyespot, and *Plasmodium* is a non-motile spore-forming parasite.

Step-by-Step Solution

1
Identify the locomotory mechanism of *Amoeba*
*Amoeba* extends pseudopodia (false feet) through streaming endoplasm and ectoplasm.
Rhizopod protozoans move exclusively via pseudopodial extension.
2
Identify the characteristic features of *Paramecium*
*Paramecium* is covered in short, hair-like cilia.
Ciliates utilize metachronal waves of cilia to swim through aquatic environments.
3
Identify the features of *Euglena*
*Euglena* uses a long flagellum for swimming and a red eyespot (stigma) for phototaxis.
The stigma directs *Euglena* toward light sources for photosynthesis.
4
Identify the features of *Plasmodium*
*Plasmodium* is a non-motile parasite producing infectious sporozoites.
Apicomplexan protozoa rely on vectors rather than active locomotory structures.

Key Concept

Classification and locomotory organelles of Kingdom Protista
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Topics

Kingdom Protista: Protozoa and Unicellular Algae

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