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Zorluk: OrtaEvolutionary Trends in Plants and Animal Systems

Which of the following sequences correctly represents the evolutionary progression of excretory structures in animals from lower invertebrates to higher vertebrates?

  1. Flame cells → Nephridia → Malpighian tubules → KidneysCevap
  2. B
    Nephridia → Flame cells → Malpighian tubules → Kidneys
  3. C
    Malpighian tubules → Nephridia → Flame cells → Kidneys
  4. D
    Flame cells → Malpighian tubules → Nephridia → Kidneys

Cevap

The correct evolutionary progression of excretory organs is Flame cells → Nephridia → Malpighian tubules → Kidneys.
Flame cells are simple proto-nephridial structures found in Platyhelminthes (flatworms). Nephridia evolved in Annelida (segmented worms) as true tubular organs. Malpighian tubules developed in terrestrial Arthropoda (insects) for conserving water. Kidneys represent the most advanced excretory organs evolved in Vertebrata.

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1
Identify the animal phyla associated with each excretory structure
Flame cells belong to Platyhelminthes, Nephridia to Annelida, Malpighian tubules to Arthropoda, and Kidneys to Vertebrata (Chordata).
Tracing excretory structures to their respective phyla allows for chronological ordering along evolutionary lines.
2
Arrange the animal phyla in increasing order of structural complexity and evolutionary appearance
Platyhelminthes (primitive acoelomate) → Annelida (segmented coelomate) → Arthropoda (specialized coelomate) → Vertebrata (advanced chordates).
Phylogenetic complexity increases from simple unsegmented invertebrates to complex coelomates and vertebrates.
3
Match the excretory organs to the evolutionary sequence of phyla
Flame cells → Nephridia → Malpighian tubules → Kidneys.
This corresponds exactly to the primitive-to-advanced progression across animal lineages.

Anahtar Kavram

Evolutionary Trends in Animal Excretory Systems
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Konular

Evolutionary Trends in Plants and Animal Systems

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