In which of the following is true metamerism first observed?

Match the following columns:

Column-$I$ (Animal)	Column-$II$ (Genus)
$P$. Sandworm	$I$. Nereis
$Q$. Earthworm	$II$. Hirudinaria
$R$. Leech	$III$. Pheretima

Which animal has the respiratory pigment $Hb$ (hemoglobin) dissolved in its blood plasma?

Given below are two statements. One is labelled as Assertion $(A)$ and other is labelled as its Reason $(R)$.
Assertion $(A) :$ In $Nereis$,longitudinal and circular muscles help in locomotion.
Reason $(R) :$ $Nereis$ is an aquatic annelid which is monoecious and possesses lateral appendages called parapodia,which help in swimming.

Larval stages are absent in the life cycle of . . . . . . .

Which of the following characteristics is $NOT$ found in the phylum $Annelida$?