Which of the following is true regarding Nereis, Pheretima and Hirudinaria?

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All are monoecious.

All are metamerically segmented.

All are aquatic animals with parapodia.

All are blood-sucking ectoparasites.

answer is C.

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Detailed Solution

All annelids (e.g., Nereis, Pheretima and Hirudinaria) exhibit metamerism. Their body is divided into distinct segments (metameres).

Nereis is dioecious, but earthworms and leeches are monoecious. Nereis and Hirudinaria are aquatic, but earthworms are terrestrial. Parapodia are present in Nereis but not in earthworms and leeches. Only Hirudinaria is a blood-sucking parasite while the other two are free-living animals.

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