alleryThe correct sequence of increasing organisational complexity in Animalia is
ACellular → Tissue → Organ → Organ-system
BCellular → Organ → Tissue → Organ-system
CTissue → Cellular → Organ-system → Organ
DOrgan → Tissue → Cellular → Organ-system
Answer & Solution
Correct answer: A. Cellular → Tissue → Organ → Organ-system
1. Sponges show cellular level of organisation (loose cell aggregates).
2. Coelenterates and Ctenophores show tissue level of organisation.
3. Platyhelminthes and higher phyla up to Aschelminthes are broadly at organ level.
4. Annelids and above (arthropods, molluscs, chordates) exhibit organ-system level.
_Source: syllabus Biology, Ch 4 "Animal Kingdom", §4.1.1_
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