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Question

Difficulty: MediumLower Invertebrates: Porifera, Coelenterata, Platyhelminthes, and Nematoda

Match each lower invertebrate representative on the left with its corresponding structural or developmental feature on the right.

  • Sycon (Sponge)Flagellated collar cells (choanocytes) lining internal canal systems
  • ObeliaAlternation of generations (metagenesis) between polyp and medusa phases
  • Fasciola (Liver fluke)Dorsoventrally flattened body possessing protonephridia with flame cells
  • Ancylostoma (Hookworm)Cylindrical unsegmented body possessing a fluid-filled pseudocoelom

Answer

Sycon pairs with flagellated collar cells (choanocytes); Obelia pairs with alternation of generations (metagenesis); Fasciola pairs with dorsoventrally flattened body and flame cells; Ancylostoma pairs with cylindrical unsegmented body possessing a pseudocoelom.
Each organism is correctly paired with the key anatomical innovation of its respective phylum: Sycon (Porifera) possesses choanocytes; Obelia (Coelenterata) displays metagenesis; Fasciola (Platyhelminthes) uses flame cells in a flattened body; and Ancylostoma (Nematoda) possesses a pseudocoelom.

Step-by-Step Solution

1
Identify the taxonomic phylum for each given organism
Sycon belongs to Porifera, Obelia to Coelenterata (Cnidaria), Fasciola to Platyhelminthes, and Ancylostoma to Nematoda.
Taxonomic classification determines the specific diagnostic tissue organization and body plan characteristics.
2
Match each organism to its unique cellular or anatomical diagnostic feature
Porifera (Sycon) have choanocytes; Coelenterata (Obelia) exhibit polyp-medusa metagenesis; Platyhelminthes (Fasciola) have flame cells; Nematoda (Ancylostoma) have a pseudocoelom.
These diagnostic structures represent distinct evolutionary features defining each of the four lower invertebrate phyla.

Key Concept

Diagnostic features of lower invertebrate phyla (Porifera, Coelenterata, Platyhelminthes, Nematoda)
Estimated Time:1m 0s
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Topics

Lower Invertebrates: Porifera, Coelenterata, Platyhelminthes, and Nematoda