In which one of the following, the organism, its two characters, and its phylum are not correctly matched, whereas the remaining three are correct?

Organism

Two
characters
Phylum
A Pila
(a)
(b)

Body is segmented
Mouth with
Radula
Mollusca
B Asterias
(a)
(b)
Spiny skin
Water vascular
system
Echinodermata
C Sycon
(a)
(b)
Bears pore
Canal system Porifera
D Periplanata
(a)
(b)

Appendages are jointed
Chitinous
exoskeleton
Arthropoda

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Solution

The correct option is A A
The animals which belong to the phylum Mollusca are soft animals with a hard exoskeleton. Pila is a group of freshwater snails. The body is covered by a calcareous shell. These animals are unsegmented. They have a distinct head, muscular foot, and visceral hump. Radula is the structure that is used by certain molluscs for feeding.
Thus, the correct answer is option A.

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	Organism		Two characters	Phylum
A	Pila	(a) (b)	Body is segmented Mouth with Radula	Mollusca
B	Asterias	(a) (b)	Spiny skin Water vascular system	Echinodermata
C	Sycon	(a) (b)	Bears pore Canal system	Porifera
D	Periplanata	(a) (b)	Appendages are jointed Chitinous exoskeleton	Arthropoda