Which of the following options correctly matches a genus with its two characters and its phylum?
1. Obelia (i) Alternation of polyp and medusa stages Cnidaria
(ii) Comb plates help in locomotion
2. Nereis (i) Metameric segmentation Annelida
(ii) Jointed legs
3. Taenia (i) Flame cells help in excretion and osmoregulation Ctenophora
(ii) Absorbs nutrients from the host through the body surface
4. Ascaris (i) Pseudocoelom Aschelminthes
(ii) Alimentary canal is complete with a mouth and an anus

Moderate

Solution

Ascaris is a pseudocoelomate with complete alimentary canal. It belongs to the phylum Aschelminthes. Comb plates occur ctenophores (not cnidarians like Obelia). Annelids (e.g., Nereis) lack jointed legs which are present in arthropods. Taenia belongs to the phylum Platyhelminthes (not Ctenophora).

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1.	Obelia	(i)	Alternation of polyp and medusa stages	Cnidaria
		(ii)	Comb plates help in locomotion
2.	Nereis	(i)	Metameric segmentation	Annelida
		(ii)	Jointed legs
3.	Taenia	(i)	Flame cells help in excretion and osmoregulation	Ctenophora
		(ii)	Absorbs nutrients from the host through the body surface
4.	Ascaris	(i)	Pseudocoelom	Aschelminthes
		(ii)	Alimentary canal is complete with a mouth and an anus