Match each lower invertebrate organism on the left with its corresponding alimentary tract and body cavity characteristic on the right.
- Spongilla (Phylum Porifera)Intracellular digestion within flagellated collar cells surrounding a central spongocoel, lacking a true gut cavity
- Physalia (Phylum Coelenterata)A sac-like gastrovascular cavity with a single opening serving as both mouth and anus in a diploblastic body
- Planaria (Phylum Platyhelminthes)A highly branched incomplete digestive tract lacking an anus within a triploblastic acoelomate body
- Enterobius (Phylum Nematoda)A complete tubular alimentary canal running from mouth to anus suspended within a fluid-filled pseudocoelom
Cevap
Spongilla matches intracellular digestion within choanocytes without a gut cavity; Physalia matches a sac-like gastrovascular cavity with a single opening; Planaria matches an incomplete branched gut in an acoelomate body; Enterobius matches a complete gut with mouth and anus inside a pseudocoelom.
Each lower invertebrate phylum demonstrates distinct structural complexity: Porifera (Spongilla) rely on collar cell intracellular digestion without a gut; Coelenterata (Physalia) feature a diploblastic gastrovascular sac with a single opening; Platyhelminthes (Planaria) are acoelomates with a branched incomplete gut; and Nematoda (Enterobius) are pseudocoelomates with a complete tubular digestive system featuring both a mouth and an anus.
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Anahtar Kavram
Evolutionary trends in digestive system completeness and body cavity organization across lower invertebrate phyla.