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Q.

Select the correct statement about the sponges.

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a

Digestion is both intracellular and extracellular in them.

b

Digestion is intracellular in them.

c

They have a complete digestive system.

d

Digestion is extracellular in them.

answer is B.

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Detailed Solution

Sponges primarily rely on intracellular digestion. The digestion occurs inside individual cells, particularly within specialised cells like choanocytes and amoebocytes (archaeocytes). Choanocytes (collar cells) trap food particles using their collar of microvilli and flagella. They ingest these particles through phagocytosis, where food vacuoles form within the cell and digestion occurs. Amoebocytes move throughout the sponge's mesohyl (gel-like matrix) and transport nutrients to other cells after digesting food particles internally.

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