The parasite found in the seminal vesicle of earthworm is:

Assertion : Typhlosole increases the effective area of absorption in the intestine.
Reason : Typhlosole,present in the intestine,is the characteristic feature of cockroach.

In earthworms,the nervous system is composed of which of the following?

$Nephridia$ in the earthworm perform the function similar to flame cells in $Taenia$.

In earthworms,which of the following statements is true regarding their blood?

Regarding blood circulation,it may be said that in $Pheretima$,the dorsal vessel is a: