Answer: Haemocyanin.
- A Haemocyanin
- B Haemoglobin
- C Myoglobin
- D Chlorophyll
Correct answer: A. Haemocyanin
Explanation: Instead of iron-based haemoglobin, many molluscs and arthropods use copper-based haemocyanin, which is bluish when oxygenated.
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.