Question

why proto nephridia are called flame cells

Answer 1

hiiii friend!!
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A protonephridia is known as a flame cell because it is a specialized excretory cell. This simply means that these cells have the ability to remove waste materials within an organ of a particular living organisms. Some freshwater invertebrates, flatworms, and rotifers have these specialized cells within their systems.
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hope this may help u!!

Answer 2

They also resemble the glowing flame of a candle or fire.. they are so called the flame cells because of their shape... they help in the excretion of Platyhelminthes