Coxal glands are the excretory organs of .........

Excretion in $Amoeba$ occurs through

Match the following columns:

Column-$I$	Column-$II$
$P$. Protonephridia / Flame cells	$I$. Prawn
$Q$. Nephridia	$II$. Earthworm
$R$. Malpighian tubules	$III$. Cockroach
$S$. Antennal gland / Green gland	$IV$. Platyhelminthes,Rotifers,some Annelids and Amphioxus

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a)$ Platyhelminthes	$(i)$ Kidney
$(b)$ Aschelminthes	$(ii)$ Flame cells
$(c)$ Protozoa	$(iii)$ Green glands
$(d)$ Arthropoda	$(iv)$ Excretory tube
$(e)$ Mammalia	$(v)$ Contractile vacuole

In vertebrates,what is the significance of the renal portal system?

Match the excretory organs listed under column $I$ with the animals given under column $II$. Choose the answer which gives the correct combination of alphabets of the two columns.

Column $I$ (Excretory organs)	Column $II$ (Animals)
$A$. Nephridia	$p$. Hydra
$B$. Malpighian tubules	$q$. Leech
$C$. Protonephridia	$r$. Shark
$D$. Kidneys	$s$. Round worms,$t$. Cockroach