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In Platyhelminthes, excretion is carried out by flame cells or protonephridia, which eliminate ammonia. Annelids use nephridia for excretion. Molluscs rely on sac-like kidneys, while Echinoderms expel nitrogenous waste through their gills. Which statement is accurate?

1. Platyhelminthes utilize nephridia for excretion.
2. Annelids excrete waste using nephridia.
3. Molluscs expel waste through gills.
4. Echinoderms use kidneys for excretion.

Correct answer: Annelids excrete waste using nephridia.

Solution

The excretory organ in Annelids is nephridia, which is correctly stated in option B. The other options incorrectly associate excretory organs with the respective phyla.

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