Which is a specialised excretory cell found in Platyhelminthes that acts like a kidney, removing waste material through filtration?

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**Solution:**

1. Platyhelminthes (flatworms) possess a specialized excretory system to remove metabolic wastes.

2. The excretory units are called **flame cells**, which have cilia that beat to create a current for filtration.

3. These flame cells function similarly to kidneys by filtering waste materials from the body fluids.

4. The flickering movement of the cilia resembles a flame, hence the name "flame cell".

5. Other options like fat cells, stem cells, and sponge cells do not perform excretory functions in Platyhelminthes.

**Answer:** Flame cell

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