In which of the following is the genus name,t | vedclass

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(A) Let's analyze each option based on the characteristics of the phylum:$1$. $A$. Pila (Mollusca): Pila belongs to the phylum Mollusca. While it has

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$A$

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(A) Let's analyze each option based on the characteristics of the phylum:$1$. $A$. Pila (Mollusca): Pila belongs to the phylum Mollusca. While it has a radula (a rasping organ for feeding),its body is unsegmented. Therefore,the character 'segmented body' is incorrect for Mollusca.$2$. $B$. Asterias (Echinodermata): Asterias belongs to the phylum Echinodermata. It possesses spiny skin (endoskeleton of calcareous ossicles) and a characteristic water vascular system. This is correctly matched.$3$. $C$. Sycon (Porifera): Sycon belongs to the phylum Porifera. It is characterized by the presence of pores (ostia) and a canal system for water circulation. This is correctly matched.$4$. $D$. Periplaneta (Arthropoda): Periplaneta (cockroach) belongs to the phylum Arthropoda. It is characterized by jointed appendages and a chitinous exoskeleton. This is correctly matched.Conclusion: Option $A$ is the mismatched one because Pila does not have a segmented body.

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Genus Name	Two Characters	Phylum
$A$. Pila	$(i)$ Segmented body,$(ii)$ Radula in mouth	Mollusca
$B$. Asterias	$(i)$ Spiny skin,$(ii)$ Water vascular system	Echinodermata
$C$. Sycon	$(i)$ Pore-bearing,$(ii)$ Canal system	Porifera
$D$. Periplaneta	$(i)$ Jointed appendages,$(ii)$ Chitinous exoskeleton	Arthropoda