Flame cells for osmoregulation are characteristic of phylum
A{'text': 'Platyhelminthes', 'label': 'A'}
B{'text': 'Aschelminthes', 'label': 'B'}
C{'text': 'Coelenterata', 'label': 'C'}
D{'text': 'Annelida', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Platyhelminthes', 'label': 'A'}
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: NCERT Class 11 Biology, Ch 4 "Animal Kingdom", §4.2.4_
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