A) porphyrin
B) haemoglobin
C) blood
D) haemocyanin
Correct Answer: A
Solution :
The dark brown colour of skin of earthworm is due to the pigment porphyrin which comes from chlorophyll in the decaying vegetable matter on which the earthworm feeds. The porphyrin is absorbed from alimentary canal by the blood and is deposited in the skin.
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