Tubular secretion is the only mode of excretion in . . . . . . .

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

Which of the following are the functions of excretory structures?

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

The nephrostomes,in the kidneys,are functional in

Salt excreting glands are found in . . . . . . .