Biology · Animal Kingdom · NEET
Flame cells are specialised cells found in flatworms (Platyhelminthes). NCERT says: 'Specialised cells called flame cells help in osmoregulation and excretion.' They are hollow cells with a tuft of cilia inside. The beating cilia move fluid, extra water and waste out of the body. For NEET, just remember: flame cells = the excretory unit of flatworms.
Inside each flame cell is a bunch of cilia (tiny hair-like threads). When these cilia beat back and forth, they flicker like the flame of a candle. That flickering movement is why they got the name flame cells. The name only describes how they look under a microscope, not that they are hot or burning.
Both. NCERT clearly states flame cells 'help in osmoregulation AND excretion.' Osmoregulation means controlling the water and salt balance in the body. Excretion means removing nitrogen waste. In many exam matches (like NEET 2019 and 2023), flame cells are simply linked to excretion in Taenia, so if a question asks for the excretory structure of a flatworm, the answer is flame cells.
Yes, they are the same excretory system. The NCERT Excretory Products chapter (Ch 16) says: 'Protonephridia or flame cells are the excretory structures in Platyhelminthes.' So flame cells and protonephridia are two names for the same thing. Protonephridia are found in flatworms, rotifers, some annelids, and the cephalochordate Amphioxus.
Flame cells (protonephridia) are the classic feature of Platyhelminthes (flatworms) like Planaria and Taenia (tapeworm). But NCERT Ch 16 adds that protonephridia are also found in rotifers, some annelids, and Amphioxus (a cephalochordate). For the Animal Kingdom chapter, remember the flatworm examples: Taenia and Planaria.
Flame cells (protonephridia) are the simpler excretory units in flatworms. Nephridia are the tubular excretory structures of earthworms (Pheretima) and other annelids. A common NEET match asks: Taenia = flame cells, Pheretima (earthworm) = nephridia. Do not mix these two up — flatworm goes with flame cells, earthworm goes with nephridia.
NEET loves 'match the column' questions that link an animal to its excretory structure. You must know: Taenia (flatworm) = flame cells, Amoeba/Paramoecium = contractile vacuole, cockroach = Malpighian tubules / uricose gland, earthworm = nephridia. Flame cells have been tested directly in NEET 2019 and NEET 2023, so this is high-yield.
Match the following organisms with their respective characteristics: Column I: A. Pila B. Bombyx C. Pleurobrachia D. Taenia Column II: i. Flame cells ii. Comb plates iii. Radula iv. Malpighian tubules Select the correct option:
Match List-I with List-II. List-I: (A) Contractile vacuole (B) Water vascular system (C) Canal system (D) Flame cells List-II: (I) Asterias (II) Amoeba (III) Spongilla (IV) Taenia Choose the correct answer:
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Flame cells carry out osmoregulation (water and salt balance) and excretion (removal of waste) in flatworms. Their beating cilia push fluid and waste out of the body through excretory pores.
Flame cells are found in Phylum Platyhelminthes (flatworms), for example in Planaria and Taenia (tapeworm). NCERT Ch 16 also lists them in rotifers, some annelids, and Amphioxus.
Yes. NCERT says 'Protonephridia or flame cells are the excretory structures in Platyhelminthes.' They are two names for the same excretory system, mainly used for osmoregulation.
Taenia (tapeworm) is a flatworm, so its excretory structures are flame cells (protonephridia). This exact match has been asked in NEET 2019 and NEET 2023.
No. Flatworms respire by simple diffusion over their whole body surface. Flame cells only do osmoregulation and excretion, not respiration.
