In SPONGES (Porifera), the level of body organisation is:
AOrgan level (tissues grouped into organs)
BCellular level (cells arranged as loose aggregates, with some division of labour)
COrgan-system level
DTissue level (cells with same function arranged into tissues)
Answer & Solution
Correct answer: B. Cellular level (cells arranged as loose aggregates, with some division of labour)
Sponges show CELLULAR level of organisation — loose cell aggregates, no tissues. Coelenterates show tissue level; Platyhelminthes show organ level; Annelids onwards show organ-system level.
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