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In which of the following, haemocyanin pigment is found?

1. Mollusca
2. Annelida
3. Echinodermata
4. Lower chordata

Correct answer: Mollusca

Solution

Haemocyanin is a copper-containing respiratory pigment found in many molluscs, where it helps transport oxygen in the blood. It is not the characteristic pigment of annelids, echinoderms, or lower chordates.

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