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_
Keep practising Unit 7C1: Evolution & Animal Structural Organisation
Browse all Unit 7C1: Evolution & Animal Structural Organisation questions for AP Biology, or explore more Biology topics.
Related questions
Which pair of features is characteristic of phylum Aschelminthes?An animal has a body plan that is diploblastic, radially symmetrical and lacks a coelom. TWhich of the following is NOT correctly matched with its phylum?Cnidarians that exhibit polyp and medusa alternating in the life cycle (Metagenesis) incluIn sponges the cells lining the spongocoel and canals areBioluminescence — the ability of a living organism to emit light — is well-marked in membeParapodia used for locomotion in the aquatic annelid Nereis are best described asAn animal is described as triploblastic, bilaterally symmetrical, coelomate and metamerica