Answer: Medusa.
- A Larva
- B Medusa
- C Nymph
- D Cyst
Correct answer: B. Medusa
Explanation: Many cnidarians show two forms - the fixed polyp (e.g. Hydra) and the free-swimming, umbrella-shaped medusa (e.g. jellyfish).
Moving across the animal phyla, body organisation becomes progressively more complex: from no symmetry and cellular organisation (Porifera) through radial/diploblastic (Cnidaria), bilateral/acoelomate (Platyhelminthes), pseudocoelomate (Nematoda), to a true coelom with full organ systems (Annelida and beyond).
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.