In which of the following sets,are the groups not correctly matched phylum-wise?

Match the following genera with their respective phylum:

$(a)$ Ophiura	$(i)$ Mollusca
$(b)$ Physalia	$(ii)$ Platyhelminthes
$(c)$ Pinctada	$(iii)$ Echinodermata
$(d)$ Planaria	$(iv)$ Coelenterata

Select the correct option:

Which of the following statements are true/false?
$(i)$ In $Torpedo$,the electric organs are capable of generating strong electric shock to paralyze the prey.
$(ii)$ Bony fishes use pectoral,pelvic,dorsal,anal,and caudal fins in swimming.
$(iii)$ Amphibian skin is moist and has thick scales.
$(iv)$ Birds are poikilothermic animals.
$(v)$ The most unique mammalian characteristic is the presence of milk-producing mammary glands by which the young ones are nourished.

Which group of animals consists of poikilothermic (cold-blooded) animals?

Which of the following is correctly matched?

$A$ fish is characterised by the presence of