In Poriferans,the skeleton is made up of | vedclass

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(A) In $Porifera$,the skeleton is formed by two types of structures:$1$. $Spicules$: These are secreted by $Scleroblast$ cells. In calcareous sponges,

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Spongin fibres and spicules

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(A) In $Porifera$,the skeleton is formed by two types of structures:$1$. $Spicules$: These are secreted by $Scleroblast$ cells. In calcareous sponges,these are called $calcoblasts$,and in siliceous sponges,they are called $silicoblasts$.$2$. $Spongin$ $fibres$: These are secreted by $Spongioblast$ cells present in the $mesohyal$ layer of the sponge body.Therefore,the skeleton of $Poriferans$ is composed of $spongin$ $fibres$ and $spicules$.

In $Poriferans$,the skeleton is made up of

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