The non-cellular layer present between pinacoderm and choanoderm in body wall of poriferans is known as

Mesoderm

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Middle lamellae

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Mesenchyme

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None of these

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Solution

The correct option is B Mesenchyme
The body of the poriferans has two layers, pinacoderm and choanoderm, separated by a gel-like layer called mesenchyme or mesohyl. It has amoeboid cells which are involved in phagocytosis.
So, the correct answer is 'Mesenchyme'.

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