$A$ blastula which is solid,is known as

How do all $Platyhelminthes$ differ from $Aschelminthes$?

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

Which of the following are correctly matched with respect to their taxonomic classification?

The appropriate sequence of numbered animals from column-$II$ matching with the sequence of larvae in column-$I$ is

Column-$I$	Column-$II$
$(a)$. Planula	$(i)$. Mussel
$(b)$. Glochidium	$(ii)$. Crab
$(c)$. Nauplius	$(iii)$. Obelia
$(d)$. Cysticercus	$(iv)$. Nereis
	$(v)$. Taenia solium

Which pair represents a group of hermaphrodite animals?