alleryFlame cells for osmoregulation are characteristic of phylum
APlatyhelminthes
BAschelminthes
CCoelenterata
DAnnelida
Answer & Solution
Correct answer: A. Platyhelminthes
1. Flame cells (also called protonephridia) are specialised excretory cells.
2. They perform osmoregulation and removal of nitrogenous waste.
3. Flame cells are diagnostic of Platyhelminthes (flatworms).
4. Annelids use nephridia; roundworms use an excretory tube; cnidarians rely on diffusion.
_Source: syllabus Biology, Ch 4 "Animal Kingdom", §4.2.4_
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