Which of the following animals is $NOT$ included in the phylum $Platyhelminthes$?

Give one example each for an animal possessing placoid scales and that with cycloid scales.

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Contractile vacuole	$(i)$ Excretory unit
$(b)$ Parapodia	$(ii)$ Food ingestion
$(c)$ Flame cells	$(iii)$ Locomotion
$(d)$ Nematocysts	$(iv)$ Osmoregulation

In which phyla is radial symmetry observed?

$A$ list of animals is given below. Identify the animals with an open circulatory system and choose the correct answer.
$(A)$ Ascidia $(B)$ Cockroach
$(C)$ Earthworm $(D)$ Prawn
$(E)$ Silverfish $(F)$ Snail
$(G)$ Squid

Select the incorrect statement regarding diploblastic organization.