Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Platyhelminthes	$(P)$ Malpighian tubules
$(2)$ Aschelminthes	$(Q)$ Nephridia
$(3)$ Arthropoda	$(R)$ Flame cells
$(4)$ Annelida	$(S)$ Renette cells

In Mollusca, excretion occurs through $......$ and in Hemichordata, it occurs through $......$.

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 :

Trochophore larva occurs in

Select the incorrect option regarding organisms exhibiting metamerism:

Match the animals listed under Column-$I$ with their respective zoological names given under Column-$II$; choose the answer that provides the correct combination of the alphabets of the two columns.
Column-$I$ (Common Name) | Column-$II$ (Zoological Name)
$A$. Starfish | $p$. Sepia
$B$. Jellyfish | $q$. Astropecten
$C$. Devilfish | $r$. Aurelia
$D$. Cuttlefish | $s$. Octopus