The skeleton of the class $Demospongiae$ is made up of ..........

  • A
    Calcareous spicules
  • B
    Siliceous spicules
  • C
    Spongin fibers
  • D
    Both spongin fibers and siliceous spicules

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Similar Questions

Assertion $(A)$: Animals are multicellular organisms composed of eukaryotic cells.
Reason $(R)$: Sponges do not perform photosynthesis and obtain nutrition by absorption.

In the animals of this phylum,the formation of gametes and internal fertilization are observed.

The classification of $Porifera$ is based on $..........$.

Reproductive cells of sponges are formed from

If a food particle is placed near the ostia of a sponge,what will happen?

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