What are the characteristics of Platyhelminthes and Aschelminthes?

$A$ blastula which is solid,is known as

Match the following columns:

Column-$I$	Column-$II$
$A$. Physalia	$1$. Liver fluke
$B$. Taenia	$2$. Sycon
$C$. Fasciola	$3$. Tapeworm
$D$. Scypha	$4$. Portuguese man-of-war

Select the correct matching sequence:

In which of the following is the genus name,two characters,and its phylum mismatched,while the other three are matched correctly?

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

Which of the following is unrelated to the others?

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.