In lower invertebrates, metabolic waste elimination and osmotic regulation rely on distinct structural adaptations across different phyla. Match each phylum on the left with its corresponding excretory or osmoregulatory feature on the right.
- PoriferaIntracellular diffusion via choanocyte-driven water currents through the osculum
- CoelenterataDirect diffusion across body layers surrounding a central gastrovascular cavity
- PlatyhelminthesNetwork of flame cells (protonephridia) functioning primarily in osmoregulation
- NematodaRenette cells and longitudinal excretory canals in a pseudocoelomic cavity
Answer
Porifera matches intracellular diffusion via choanocyte-driven water currents through the osculum; Coelenterata matches direct diffusion across body layers surrounding a central gastrovascular cavity; Platyhelminthes matches network of flame cells (protonephridia) functioning primarily in osmoregulation; Nematoda matches renette cells and longitudinal excretory canals in a pseudocoelomic cavity.
Each lower invertebrate phylum demonstrates an evolutionary progression in waste management and fluid balance: Porifera rely on individual cell diffusion powered by choanocyte water movement; Coelenterata use direct diffusion across their two tissue layers into the gastrovascular cavity; Platyhelminthes employ flame cells within protonephridia for osmoregulation; and Nematoda utilize renette cells coupled with excretory canals housed in their pseudocoelom.
Step-by-Step Solution
Key Concept
Excretory and osmoregulatory mechanisms across lower invertebrate phyla