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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 $(Earthworm, Leech)$.

$(a)$ Ophiura	$(i)$ Mollusca
$(b)$ Physalia	$(ii)$ Platyhelminthes
$(c)$ Pinctada	$(iii)$ Echinodermata
$(d)$ Planaria	$(iv)$ Coelenterata

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

Similar Questions

Which of the following organisms possess an open-type circulatory system?

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$(a)$ Ophiura $(i)$ Mollusca
$(b)$ Physalia $(ii)$ Platyhelminthes
$(c)$ Pinctada $(iii)$ Echinodermata
$(d)$ Planaria $(iv)$ Coelenterata

Select the correct option:

Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?

Identify the correct statement:

Find the odd example.

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