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(D) In the phylum $Annelida$, organisms can be either unisexual or bisexual.$Nereis$ is an aquatic form which is dioecious (unisexual), meaning male a

Vedclass · Accepted Answer

Nereis $\quad\quad$ Earthworm,Leech

Vedclass · Answer

(D) In the phylum $Annelida$, organisms can be either unisexual or bisexual.$Nereis$ is an aquatic form which is dioecious (unisexual), meaning male and female reproductive organs are present in separate individuals.Earthworms $(Pheretima)$ and leeches $(Hirudinaria)$ are monoecious (bisexual or hermaphrodite), meaning both male and female reproductive organs are present in the same individual.Therefore, the correct classification is: Unisexual organisms $(Nereis)$ and Bisexual organisms $(Earthworm, Leech)$.

List $I$	List $II$
$A$. Pleurobrachia	$I$. Mollusca
$B$. Radula	$II$. Ctenophora
$C$. Stomochord	$III$. Osteichthyes
$D$. Air bladder	$IV$. Hemichordata

Select the correct option based on the sex of the organisms.
Unisexual organisms $\quad\quad$ Bisexual organisms

Similar Questions

The given figure shows four animals $A, B, C$ and $D$. Select the correct option regarding the common features shared by any two of them.

Select the correct option for the following classification: Vertebrate and Invertebrate.

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 :

Statement $X$: All chordates are not vertebrates.
Reason $Y$: $Balanoglossus$ is not a vertebrate.

The point by which $Annelida$ advanced over $Nematoda$ is

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Select the correct option based on the sex of the organisms.Unisexual organisms $\quad\quad$ Bisexual organisms