Match List $I$ with List $II$ :

List $I$	List $II$
$A$. Pleurobrachia	$I$. Mollusca
$B$. Radula	$II$. Ctenophora
$C$. Stomochord	$III$. Osteichthyes
$D$. Air bladder	$IV$. Hemichordata

Choose the correct answer from the options given below :

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

Identify the mismatch among the following pairs:

The given figure shows four animals $A, B, C$ and $D$. Select the correct option regarding the common features shared by any two of them.

What is the exoskeleton of fish made of?

Match the animal name in Column-$I$,its characteristic in Column-$II$,and its Phylum/Class in Column-$III$ correctly.
Column-$I$ (Animal) | Column-$II$ (Characteristic) | Column-$III$ (Phylum/Class)
$A$. Adamsia | $i$. Radial symmetry | $x$. Porifera
$B$. Petromyzon | $ii$. Ectoparasite | $y$. Cyclostomata
$C$. Ichthyophis | $iii$. Terrestrial | $z$. Reptilia
$D$. Limulus | $iv$. Body covered by chitinous exoskeleton | $w$. Pisces