Identify the correct terms for the following analogy-based questions:
$(i)$ Porifera : Choanocytes :: Platyhelminthes : ....
$(ii)$ Chondrichthyes : Placoid scales :: Osteichthyes : ....

  • A
    $(i)$ Flame cells,$(ii)$ Cycloid scales
  • B
    $(i)$ Cnidoblasts,$(ii)$ Ctenoid scales
  • C
    $(i)$ Nephridia,$(ii)$ Placoid scales
  • D
    $(i)$ Choanocytes,$(ii)$ Ctenoid scales

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The appropriate sequence of numbered animals from column-$II$ matching with the sequence of larvae in column-$I$ is
Column-$I$Column-$II$
$(a)$. Planula$(i)$. Mussel
$(b)$. Glochidium$(ii)$. Crab
$(c)$. Nauplius$(iii)$. Obelia
$(d)$. Cysticercus$(iv)$. Nereis
$(v)$. Taenia solium

Which of the following possess larval stages?

Match the following columns:
Column-$I$ Column-$II$
$(a)$ Water vascular system $(i)$ Balanoglossus
$(b)$ Malpighian tubule $(ii)$ Hyalonema
$(c)$ Amphiblastula $(iii)$ Sea lily (Antedon)
$(d)$ Proboscis gland $(iv)$ Periplaneta

Which one of the following animals is correctly matched with its one characteristic and the taxon?
Animal - Characteristic - Taxon

In which of the following organisms is metamerism (segmentation) observed?

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