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Difficulty: MediumKingdom Protista: Protozoa and Unicellular Algae

Match each organism belonging to Kingdom Protista listed on the left with its characteristic reproductive mechanism or feeding behavior on the right.

  • *Plasmodium*Produces sporozoites and merozoites during complex parasitic life cycle stages in two hosts
  • *Paramecium*Undergoes sexual reproduction by conjugation involving reciprocal exchange of micronuclei
  • *Chlamydomonas*Produces haploid biflagellated zoospores during asexual reproduction and isogametes during sexual reproduction
  • *Amoeba*Engulfs food particles via phagocytosis using pseudopodia and forms protective cysts under adverse conditions

Answer

*Plasmodium* matches parasite life cycle stages (sporozoites/merozoites); *Paramecium* matches conjugation via micronuclei; *Chlamydomonas* matches biflagellated zoospores/isogametes; *Amoeba* matches phagocytosis via pseudopodia and encystment.
Each protist is correctly paired with its defining physiological or life-cycle trait: *Plasmodium* forms sporozoites and merozoites in its parasitic cycle; *Paramecium* exchanges micronuclei during conjugation; *Chlamydomonas* forms zoospores asexually and isogametes sexually; *Amoeba* employs pseudopodia for phagocytosis and forms protective cysts.

Step-by-Step Solution

1
Identify the distinct biological classification and life cycle of parasitic protozoans.
*Plasmodium* is an sporozoan/apicomplexan parasite characterized by forming merozoites in hepatocytes/erythrocytes and sporozoites in mosquitoes.
This establishes the correct pairing for the obligate parasite.
2
Identify the nuclear feature and sexual process in ciliates.
*Paramecium* undergoes conjugation where micronuclei divide meiotically and are exchanged between fused cells.
Nuclear exchange during conjugation is unique to ciliates like *Paramecium*.
3
Analyze the reproductive pathways of unicellular photosynthetic algae.
*Chlamydomonas* forms flagellated zoospores asexually inside its parent cell wall and produces flagellated isogametes under nutrient deprivation.
These flagellated reproductive cells define the algal life cycle of *Chlamydomonas*.
4
Examine the feeding and survival adaptation of rhizopods.
*Amoeba* uses pseudopodia to ingest food via phagocytosis and secretes a cyst wall under adverse conditions.
Pseudopodial phagocytosis and encystment are defining traits of amoeboid protists.

Key Concept

Diversity, modes of nutrition, locomotion, and reproductive mechanisms in Kingdom Protista
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Topics

Kingdom Protista: Protozoa and Unicellular Algae

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